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Re: Syntax locations are ambiguous: can we track source 'offset' and 'le


From: Vivien Kraus
Subject: Re: Syntax locations are ambiguous: can we track source 'offset' and 'length'?
Date: Wed, 04 Aug 2021 01:51:20 +0200
User-agent: mu4e 1.4.15; emacs 27.2

Linus Björnstam writes:

> On Tue, 3 Aug 2021, at 00:50, Vivien Kraus via General Guile related 
> discussions wrote:
>> (syntax-case
>>     (call-with-input-string "(a\r b)" read-syntax) ()
>>   ((a b)
>>    (values (syntax-source #'a) (syntax-source #'b))))
>> 
>> =>
>> 
>> $1 = ((line . 0) (column . 1))
>> $2 = ((line . 0) (column . 1))
>> 
>> This is obviously because of #\return.
>
> Well, if anything this has confused the guile reader. It is probably a
> bug: I suspect it resets the column because it anticipates a
> windows-style newline.

Maybe the correct behavior should be to entirely ignore #\return when
computing the line/column?

I see in libguile/ports.c (update_port_position) that #\return and
#\backspace may break the monotony of the position by strictly reducing
it.

I read here:
https://www.gnu.org/prep/standards/html_node/Errors.html#Errors

that the recommended solution is to use wcwidth, to give every non-ASCII
character at least a null width. Is there a reason not to use wcwidth?
If not, what do you think of the attached patch?

>  But are you often dealing with lonely "\r" in sources? Using either
>  \n (unix-style) or \r\n (window-style) will give you the correct
>  results.

Agreed. I don’t control the input, but I can silently drop all weird
characters (#\return, #\backspace and #\alarm) and almost noone [1] will
notice.

Vivien

[1] If it’s in a string literal, we can replace it with \r, \b or \a
anyway.

>From 877859973b768d76547fe58acd37bca42c7b013e Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Wed, 4 Aug 2021 01:03:20 +0200
Subject: [PATCH 1/4] Update Gnulib

---
 build-aux/announce-gen           |  49 +-
 build-aux/gendocs.sh             |   6 +-
 build-aux/git-version-gen        |   8 +-
 build-aux/gnupload               |  17 +-
 build-aux/useless-if-before-free |  18 +-
 lib/Makefile.am                  | 986 ++++++++++++++++---------------
 lib/accept.c                     |  10 +-
 lib/accept4.c                    |  14 +-
 lib/alignof.h                    |  12 +-
 lib/alloca.c                     |   4 +-
 lib/alloca.in.h                  |  20 +-
 lib/arpa_inet.in.h               |  12 +-
 lib/asnprintf.c                  |  14 +-
 lib/assure.h                     |  10 +-
 lib/attribute.h                  |  16 +-
 lib/basename-lgpl.c              |  10 +-
 lib/basename-lgpl.h              |  26 +-
 lib/binary-io.c                  |  10 +-
 lib/binary-io.h                  |  10 +-
 lib/bind.c                       |  10 +-
 lib/btowc.c                      |  10 +-
 lib/byteswap.in.h                |  10 +-
 lib/c-ctype.c                    |  18 +
 lib/c-ctype.h                    |  24 +-
 lib/c-strcase.h                  |  12 +-
 lib/c-strcasecmp.c               |  12 +-
 lib/c-strcaseeq.h                |  14 +-
 lib/c-strncasecmp.c              |  12 +-
 lib/cdefs.h                      |  18 +-
 lib/ceil.c                       |  10 +-
 lib/cloexec.c                    |  14 +-
 lib/cloexec.h                    |  14 +-
 lib/close.c                      |  10 +-
 lib/connect.c                    |  10 +-
 lib/copysign.c                   |  10 +-
 lib/dirent.in.h                  |  10 +-
 lib/dirfd.c                      |  10 +-
 lib/dirname-lgpl.c               |  10 +-
 lib/dirname.h                    |  38 +-
 lib/dup2.c                       |  10 +-
 lib/duplocale.c                  |  10 +-
 lib/dynarray.h                   |  20 +-
 lib/errno.in.h                   |  12 +-
 lib/fcntl.c                      |  10 +-
 lib/fcntl.in.h                   |  10 +-
 lib/fd-hook.c                    |  14 +-
 lib/fd-hook.h                    |  14 +-
 lib/float+.h                     |  12 +-
 lib/float.c                      |  10 +-
 lib/float.in.h                   |  10 +-
 lib/floor.c                      |  10 +-
 lib/free.c                       |  10 +-
 lib/frexp.c                      |  10 +-
 lib/fstat.c                      |  10 +-
 lib/fsync.c                      |  14 +-
 lib/full-read.c                  |  10 +-
 lib/full-read.h                  |  10 +-
 lib/full-write.c                 |  10 +-
 lib/full-write.h                 |  10 +-
 lib/gai_strerror.c               |  12 +-
 lib/getaddrinfo.c                |  12 +-
 lib/getdtablesize.c              |  10 +-
 lib/getlogin.c                   |  10 +-
 lib/getpeername.c                |  10 +-
 lib/getrandom.c                  |  16 +-
 lib/getsockname.c                |  10 +-
 lib/getsockopt.c                 |  10 +-
 lib/gettext.h                    |  14 +-
 lib/hard-locale.c                |  10 +-
 lib/hard-locale.h                |  10 +-
 lib/iconv.c                      |  14 +-
 lib/iconv.in.h                   |  12 +-
 lib/iconv_close.c                |  14 +-
 lib/iconv_open-aix.gperf         |  14 +-
 lib/iconv_open-hpux.gperf        |  14 +-
 lib/iconv_open-irix.gperf        |  14 +-
 lib/iconv_open-osf.gperf         |  14 +-
 lib/iconv_open-solaris.gperf     |  14 +-
 lib/iconv_open-zos.gperf         |  14 +-
 lib/iconv_open.c                 |  14 +-
 lib/iconveh.h                    |  10 +-
 lib/inet_ntop.c                  |  12 +-
 lib/inet_pton.c                  |  10 +-
 lib/inttypes.in.h                |  10 +-
 lib/isfinite.c                   |  14 +-
 lib/isinf.c                      |  14 +-
 lib/isnan.c                      |  10 +-
 lib/isnand-nolibm.h              |  10 +-
 lib/isnand.c                     |  10 +-
 lib/isnanf-nolibm.h              |  10 +-
 lib/isnanf.c                     |  10 +-
 lib/isnanl-nolibm.h              |  10 +-
 lib/isnanl.c                     |  10 +-
 lib/itold.c                      |  10 +-
 lib/langinfo.in.h                |  12 +-
 lib/lc-charset-dispatch.c        |  10 +-
 lib/lc-charset-dispatch.h        |  10 +-
 lib/libc-config.h                |  17 +-
 lib/libunistring.valgrind        |  22 +-
 lib/limits.in.h                  |  28 +-
 lib/link.c                       |  12 +-
 lib/listen.c                     |  10 +-
 lib/localcharset.c               |  14 +-
 lib/localcharset.h               |  14 +-
 lib/locale.in.h                  |  10 +-
 lib/localeconv.c                 |  10 +-
 lib/log.c                        |  10 +-
 lib/log1p.c                      |  10 +-
 lib/lstat.c                      |  10 +-
 lib/malloc.c                     |  47 +-
 lib/malloca.c                    |  36 +-
 lib/malloca.h                    |  23 +-
 lib/math.c                       |  18 +
 lib/math.in.h                    |  10 +-
 lib/mbrtowc-impl-utf8.h          |  10 +-
 lib/mbrtowc-impl.h               |  10 +-
 lib/mbrtowc.c                    |  10 +-
 lib/mbsinit.c                    |  10 +-
 lib/mbtowc-impl.h                |  10 +-
 lib/mbtowc-lock.c                |  10 +-
 lib/mbtowc-lock.h                |  10 +-
 lib/mbtowc.c                     |  10 +-
 lib/memchr.c                     |  24 +-
 lib/memchr.valgrind              |  10 +-
 lib/mempcpy.c                    |  12 +-
 lib/minmax.h                     |  12 +-
 lib/mkdir.c                      |  10 +-
 lib/mkostemp.c                   |  10 +-
 lib/msvc-inval.c                 |  14 +-
 lib/msvc-inval.h                 |  14 +-
 lib/msvc-nothrow.c               |  14 +-
 lib/msvc-nothrow.h               |  14 +-
 lib/netdb.in.h                   |  12 +-
 lib/netinet_in.in.h              |  12 +-
 lib/nl_langinfo-lock.c           |  10 +-
 lib/nl_langinfo.c                |  10 +-
 lib/nproc.c                      |  12 +-
 lib/nproc.h                      |  12 +-
 lib/nstrftime.c                  |  19 +-
 lib/open.c                       |  10 +-
 lib/pathmax.h                    |  12 +-
 lib/pipe.c                       |  14 +-
 lib/pipe2.c                      |  14 +-
 lib/poll.c                       |  14 +-
 lib/poll.in.h                    |  14 +-
 lib/printf-args.c                |  14 +-
 lib/printf-args.h                |  14 +-
 lib/printf-parse.c               |  25 +-
 lib/printf-parse.h               |  14 +-
 lib/putenv.c                     |  10 +-
 lib/raise.c                      |  10 +-
 lib/rawmemchr.c                  |  10 +-
 lib/rawmemchr.valgrind           |  10 +-
 lib/read.c                       |  10 +-
 lib/readlink.c                   |  10 +-
 lib/realloc.c                    |  68 +--
 lib/recv.c                       |  10 +-
 lib/recvfrom.c                   |  10 +-
 lib/regex_internal.c             |   9 +-
 lib/regexec.c                    |  12 +-
 lib/rename.c                     |  10 +-
 lib/rmdir.c                      |  10 +-
 lib/round.c                      |  14 +-
 lib/safe-read.c                  |  10 +-
 lib/safe-read.h                  |  10 +-
 lib/safe-write.c                 |  10 +-
 lib/safe-write.h                 |  10 +-
 lib/same-inode.h                 |  10 +-
 lib/scratch_buffer.h             |  20 +-
 lib/select.c                     |  23 +-
 lib/send.c                       |  10 +-
 lib/sendto.c                     |  10 +-
 lib/setenv.c                     |  10 +-
 lib/setlocale-lock.c             |  10 +-
 lib/setlocale_null.c             |  10 +-
 lib/setlocale_null.h             |  10 +-
 lib/setsockopt.c                 |  10 +-
 lib/shutdown.c                   |  10 +-
 lib/signal.in.h                  |  10 +-
 lib/signbitd.c                   |  10 +-
 lib/signbitf.c                   |  10 +-
 lib/signbitl.c                   |  10 +-
 lib/size_max.h                   |  12 +-
 lib/snprintf.c                   |  14 +-
 lib/socket.c                     |  10 +-
 lib/sockets.c                    |  10 +-
 lib/sockets.h                    |  10 +-
 lib/stat-time.c                  |  18 +
 lib/stat-time.h                  |  10 +-
 lib/stat-w32.c                   |  10 +-
 lib/stat-w32.h                   |  10 +-
 lib/stat.c                       |  10 +-
 lib/stdalign.in.h                |  12 +-
 lib/stdbool.in.h                 |  12 +-
 lib/stddef.in.h                  |  12 +-
 lib/stdint.in.h                  |  16 +-
 lib/stdio.in.h                   |  20 +-
 lib/stdlib.in.h                  |  25 +-
 lib/strdup.c                     |  14 +-
 lib/streq.h                      |  14 +-
 lib/strftime.h                   |  10 +-
 lib/striconveh.c                 |  10 +-
 lib/striconveh.h                 |  10 +-
 lib/string.in.h                  |  14 +-
 lib/stripslash.c                 |  10 +-
 lib/sys-limits.h                 |  12 +-
 lib/sys_file.in.h                |  12 +-
 lib/sys_random.in.h              |  12 +-
 lib/sys_select.in.h              |  12 +-
 lib/sys_socket.c                 |  18 +
 lib/sys_socket.in.h              |  12 +-
 lib/sys_stat.in.h                |  12 +-
 lib/sys_time.in.h                |  12 +-
 lib/sys_times.in.h               |  12 +-
 lib/sys_types.in.h               |  12 +-
 lib/sys_uio.in.h                 |  12 +-
 lib/tempname.h                   |  10 +-
 lib/time-internal.h              |  14 +-
 lib/time.in.h                    |  12 +-
 lib/time_r.c                     |  14 +-
 lib/time_rz.c                    |  14 +-
 lib/times.c                      |  12 +-
 lib/trunc.c                      |  10 +-
 lib/tzset.c                      |  12 +-
 lib/unistd.c                     |  18 +
 lib/unistd.in.h                  |  25 +-
 lib/unsetenv.c                   |  10 +-
 lib/vasnprintf.c                 |  50 +-
 lib/vasnprintf.h                 |  14 +-
 lib/verify.h                     |  14 +-
 lib/vsnprintf.c                  |  14 +-
 lib/w32sock.h                    |  10 +-
 lib/wchar.in.h                   |  14 +-
 lib/wcrtomb.c                    |  10 +-
 lib/wctype-h.c                   |  19 +
 lib/wctype.in.h                  |  22 +-
 lib/windows-initguard.h          |  12 +-
 lib/write.c                      |  10 +-
 lib/xalloc-oversized.h           |  47 +-
 lib/xsize.c                      |  18 +
 lib/xsize.h                      |  12 +-
 m4/arpa_inet_h.m4                |  31 +-
 m4/dirent_h.m4                   |  45 +-
 m4/environ.m4                    |   5 +-
 m4/fcntl_h.m4                    |  39 +-
 m4/flock.m4                      |   4 +-
 m4/fstat.m4                      |   4 +-
 m4/getaddrinfo.m4                |  10 +-
 m4/gnulib-cache.m4               |   2 +-
 m4/gnulib-common.m4              | 126 +++-
 m4/gnulib-comp.m4                | 140 +++--
 m4/hostent.m4                    |   4 +-
 m4/iconv_h.m4                    |  27 +-
 m4/inttypes.m4                   |  31 +-
 m4/langinfo_h.m4                 |  25 +-
 m4/largefile.m4                  |  28 +-
 m4/limits-h.m4                   |   3 +-
 m4/locale_h.m4                   |  37 +-
 m4/malloc.m4                     | 152 +++--
 m4/math_h.m4                     | 227 +++----
 m4/memchr.m4                     |   4 +-
 m4/mempcpy.m4                    |   4 +-
 m4/mktime.m4                     |   4 +-
 m4/netdb_h.m4                    |  25 +-
 m4/poll_h.m4                     |  29 +-
 m4/printf.m4                     |   5 +-
 m4/rawmemchr.m4                  |   4 +-
 m4/realloc.m4                    |  47 +-
 m4/regex.m4                      |  44 +-
 m4/select.m4                     |   4 +-
 m4/servent.m4                    |   4 +-
 m4/signal_h.m4                   |  33 +-
 m4/sockpfaf.m4                   |   6 +-
 m4/stat.m4                       |   4 +-
 m4/stddef_h.m4                   |  23 +-
 m4/stdint.m4                     |   6 +-
 m4/stdio_h.m4                    | 168 +++---
 m4/stdlib_h.m4                   | 116 ++--
 m4/strdup.m4                     |   6 +-
 m4/string_h.m4                   | 124 ++--
 m4/sys_file_h.m4                 |  29 +-
 m4/sys_random_h.m4               |  25 +-
 m4/sys_select_h.m4               |  29 +-
 m4/sys_socket_h.m4               |  53 +-
 m4/sys_stat_h.m4                 |  65 +-
 m4/sys_time_h.m4                 |  34 +-
 m4/sys_times_h.m4                |  25 +-
 m4/sys_types_h.m4                |  16 +-
 m4/sys_uio_h.m4                  |  23 +-
 m4/threadlib.m4                  |  64 +-
 m4/time_h.m4                     |  62 +-
 m4/time_r.m4                     |   2 +-
 m4/time_rz.m4                    |   2 +-
 m4/timegm.m4                     |   4 +-
 m4/tzset.m4                      |   4 +-
 m4/unistd_h.m4                   | 194 +++---
 m4/visibility.m4                 |   6 +-
 m4/wchar_h.m4                    | 109 ++--
 m4/wctype_h.m4                   |  39 +-
 m4/wint_t.m4                     |  10 +-
 m4/year2038.m4                   | 124 ++++
 maint.mk                         |   3 +-
 302 files changed, 3888 insertions(+), 2843 deletions(-)
 create mode 100644 m4/year2038.m4

diff --git a/build-aux/announce-gen b/build-aux/announce-gen
index 84d2d6378..2d8a2036b 100755
--- a/build-aux/announce-gen
+++ b/build-aux/announce-gen
@@ -35,12 +35,14 @@
 eval 'exec perl -wSx "$0" "$@"'
      if 0;
 
-my $VERSION = '2020-05-10 16:13'; # UTC
+my $VERSION = '2021-08-03 19:15'; # UTC
 # The definition above must lie within the first 8 lines in order
 # for the Emacs time-stamp write hook (at end) to update it.
 # If you change this file with Emacs, please let the write hook
 # do its job.  Otherwise, update this string manually.
 
+my $copyright_year = '2021';
+
 use strict;
 use Getopt::Long;
 use POSIX qw(strftime);
@@ -49,12 +51,6 @@ use POSIX qw(strftime);
 
 my %valid_release_types = map {$_ => 1} qw (alpha beta stable);
 my @archive_suffixes = qw (tar.gz tar.bz2 tar.lz tar.lzma tar.xz);
-my %digest_classes =
-  (
-   'md5' => (eval { require Digest::MD5; } and 'Digest::MD5'),
-   'sha1' => ((eval { require Digest::SHA; } and 'Digest::SHA')
-              or (eval { require Digest::SHA1; } and 'Digest::SHA1'))
-  );
 my $srcdir = '.';
 
 sub usage ($)
@@ -94,7 +90,7 @@ The following are optional:
                                 VERSION is the result of running git describe
                                 in the gnulib source directory.
                                 required if gnulib is in TOOL_LIST.
-   --no-print-checksums         do not emit MD5 or SHA1 checksums
+   --no-print-checksums         do not emit SHA1 or SHA256 checksums
    --archive-suffix=SUF         add SUF to the list of archive suffixes
    --mail-headers=HEADERS       a space-separated list of mail headers, e.g.,
                                 To: x\@example.com Cc: 
y-announce\@example.com,...
@@ -161,7 +157,7 @@ sub print_locations ($\@\%@)
 
 =item C<print_checksums (@file)
 
-Print the MD5 and SHA1 signature section for each C<@file>.
+Print the SHA1 and SHA256 signature section for each C<@file>.
 
 =cut
 
@@ -169,23 +165,18 @@ sub print_checksums (@)
 {
   my (@file) = @_;
 
-  print "Here are the MD5 and SHA1 checksums:\n";
+  print "Here are the SHA1 and SHA256 checksums:\n";
   print "\n";
 
-  foreach my $meth (qw (md5 sha1))
+  use Digest::file qw(digest_file_hex digest_file_base64);
+
+  foreach my $f (@file)
     {
-      my $class = $digest_classes{$meth} or next;
-      foreach my $f (@file)
-        {
-          open IN, '<', $f
-            or die "$ME: $f: cannot open for reading: $!\n";
-          binmode IN;
-          my $dig = $class->new->addfile(*IN)->hexdigest;
-          close IN;
-          print "$dig  $f\n";
-        }
+      print digest_file_hex($f, "SHA-1"), "  $f\n";
+      print digest_file_base64($f, "SHA-256"), "  $f\n";
     }
-  print "\n";
+  print "\nThe SHA256 checksum is base64 encoded and not hexadecimal,\n";
+  print "which is the default for most checksum tools.\n\n";
 }
 
 =item C<print_news_deltas ($news_file, $prev_version, $curr_version)
@@ -413,7 +404,19 @@ sub get_tool_versions ($$)
      'archive-suffix=s'   => \@archive_suffixes,
 
      help => sub { usage 0 },
-     version => sub { print "$ME version $VERSION\n"; exit },
+     version =>
+       sub
+       {
+         print "$ME version $VERSION\n";
+         print "Copyright (C) $copyright_year Free Software Foundation, 
Inc.\n";
+         print "License GPLv3+: GNU GPL version 3 or later 
<https://gnu.org/licenses/gpl.html>.\n"
+             . "This is free software: you are free to change and redistribute 
it.\n"
+             . "There is NO WARRANTY, to the extent permitted by law.\n";
+         print "\n";
+         my $author = "Jim Meyering";
+         print "Written by $author.\n";
+         exit
+       },
     ) or usage 1;
 
   my $fail = 0;
diff --git a/build-aux/gendocs.sh b/build-aux/gendocs.sh
index 1872de9d5..1241ee35a 100755
--- a/build-aux/gendocs.sh
+++ b/build-aux/gendocs.sh
@@ -2,7 +2,7 @@
 # gendocs.sh -- generate a GNU manual in many formats.  This script is
 #   mentioned in maintain.texi.  See the help message below for usage details.
 
-scriptversion=2021-01-01.00
+scriptversion=2021-07-19.18
 
 # Copyright 2003-2021 Free Software Foundation, Inc.
 #
@@ -58,7 +58,7 @@ EMAIL=webmasters@gnu.org  # please override with --email
 commonarg= # passed to all makeinfo/texi2html invcations.
 dirargs=   # passed to all tools (-I dir).
 dirs=      # -I directories.
-htmlarg="--css-ref=/software/gnulib/manual.css -c TOP_NODE_UP_URL=/manual"
+htmlarg="--css-ref=https://www.gnu.org/software/gnulib/manual.css -c 
TOP_NODE_UP_URL=/manual"
 default_htmlarg=true
 infoarg=--no-split
 generate_ascii=true
@@ -202,7 +202,7 @@ base=$PACKAGE
 
 if $default_htmlarg && test -n "$use_texi2html"; then
   # The legacy texi2html doesn't support TOP_NODE_UP_URL
-  htmlarg="--css-ref=/software/gnulib/manual.css"
+  htmlarg="--css-ref=https://www.gnu.org/software/gnulib/manual.css";
 fi
 
 if test -n "$srcfile"; then
diff --git a/build-aux/git-version-gen b/build-aux/git-version-gen
index be0fc2088..5e42afb2c 100755
--- a/build-aux/git-version-gen
+++ b/build-aux/git-version-gen
@@ -75,10 +75,10 @@ me=$0
 year=`expr "$scriptversion" : '\([^-]*\)'`
 version="git-version-gen $scriptversion
 
-Copyright $year Free Software Foundation, Inc.
-There is NO warranty.  You may redistribute this software
-under the terms of the GNU General Public License.
-For more information about these matters, see the files named COPYING."
+Copyright (C) ${year} Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law."
 
 usage="\
 Usage: $me [OPTION]... \$srcdir/.tarball-version [TAG-NORMALIZATION-SED-SCRIPT]
diff --git a/build-aux/gnupload b/build-aux/gnupload
index 434741d1e..e7822aed7 100755
--- a/build-aux/gnupload
+++ b/build-aux/gnupload
@@ -1,13 +1,13 @@
 #!/bin/sh
 # Sign files and upload them.
 
-scriptversion=2018-05-19.18; # UTC
+scriptversion=2021-04-11.09; # UTC
 
 # Copyright (C) 2004-2021 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3, or (at your option)
+# the Free Software Foundation; either version 2, or (at your option)
 # any later version.
 #
 # This program is distributed in the hope that it will be useful,
@@ -27,8 +27,8 @@ set -e
 GPG=gpg
 # Choose the proper version of gpg, so as to avoid a
 # "gpg-agent is not available in this session" error
-# when gpg-agent is version 3 but gpg is still version 1.
-# FIXME-2020: remove, once all major distros ship gpg version 3 as /usr/bin/gpg
+# when gpg-agent is version 2 but gpg is still version 1.
+# FIXME-2020: remove, once all major distros ship gpg version 2 as /usr/bin/gpg
 gpg_agent_version=`(gpg-agent --version) 2>/dev/null | sed -e '2,$d' -e 
's/^[^0-9]*//'`
 case "$gpg_agent_version" in
   2.*)
@@ -145,6 +145,12 @@ the build-aux/ directory of the gnulib package
 
 Send patches and bug reports to <bug-gnulib@gnu.org>."
 
+copyright_year=`echo "$scriptversion" | sed -e 's/[^0-9].*//'`
+copyright="Copyright (C) ${copyright_year} Free Software Foundation, Inc.
+License GPLv2+: GNU GPL version 2 or later <https://gnu.org/licenses/gpl.html>.
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law."
+
 # Read local configuration file
 if test -r "$conffile"; then
   echo "$0: Reading configuration file $conffile"
@@ -209,7 +215,8 @@ while test -n "$1"; do
       ;;
     --version)
       echo "gnupload $scriptversion"
-      exit $?
+      echo "$copyright"
+      exit 0
       ;;
     --)
       shift
diff --git a/build-aux/useless-if-before-free b/build-aux/useless-if-before-free
index 784d80b3e..5bbbc44c5 100755
--- a/build-aux/useless-if-before-free
+++ b/build-aux/useless-if-before-free
@@ -36,12 +36,14 @@
 eval 'exec perl -wSx "$0" "$@"'
      if 0;
 
-my $VERSION = '2020-04-04 15:07'; # UTC
+my $VERSION = '2021-04-11 10:11'; # UTC
 # The definition above must lie within the first 8 lines in order
 # for the Emacs time-stamp write hook (at end) to update it.
 # If you change this file with Emacs, please let the write hook
 # do its job.  Otherwise, update this string manually.
 
+my $copyright_year = '2021';
+
 use strict;
 use warnings;
 use Getopt::Long;
@@ -118,7 +120,19 @@ sub is_NULL ($)
   GetOptions
     (
      help => sub { usage 0 },
-     version => sub { print "$ME version $VERSION\n"; exit },
+     version =>
+       sub
+       {
+         print "$ME version $VERSION\n";
+         print "Copyright (C) $copyright_year Free Software Foundation, 
Inc.\n";
+         print "License GPLv3+: GNU GPL version 3 or later 
<https://gnu.org/licenses/gpl.html>.\n"
+             . "This is free software: you are free to change and redistribute 
it.\n"
+             . "There is NO WARRANTY, to the extent permitted by law.\n";
+         print "\n";
+         my $author = "Jim Meyering";
+         print "Written by $author.\n";
+         exit
+       },
      list => \$list,
      'name=s@' => \@name,
     ) or usage 1;
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 02480f6e9..cb29c3136 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -288,8 +288,8 @@ arpa/inet.h: arpa_inet.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(WARN_ON
              -e 's|@''HAVE_FEATURES_H''@|$(HAVE_FEATURES_H)|g' \
              -e 's|@''NEXT_ARPA_INET_H''@|$(NEXT_ARPA_INET_H)|g' \
              -e 's|@''HAVE_ARPA_INET_H''@|$(HAVE_ARPA_INET_H)|g' \
-             -e 's/@''GNULIB_INET_NTOP''@/$(GNULIB_INET_NTOP)/g' \
-             -e 's/@''GNULIB_INET_PTON''@/$(GNULIB_INET_PTON)/g' \
+             -e 's/@''GNULIB_INET_NTOP''@/$(GL_GNULIB_INET_NTOP)/g' \
+             -e 's/@''GNULIB_INET_PTON''@/$(GL_GNULIB_INET_PTON)/g' \
              -e 's|@''HAVE_WS2TCPIP_H''@|$(HAVE_WS2TCPIP_H)|g' \
              -e 's|@''HAVE_DECL_INET_NTOP''@|$(HAVE_DECL_INET_NTOP)|g' \
              -e 's|@''HAVE_DECL_INET_PTON''@|$(HAVE_DECL_INET_PTON)|g' \
@@ -470,14 +470,14 @@ dirent.h: dirent.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_DIRENT_H''@|$(NEXT_DIRENT_H)|g' \
-             -e 's/@''GNULIB_OPENDIR''@/$(GNULIB_OPENDIR)/g' \
-             -e 's/@''GNULIB_READDIR''@/$(GNULIB_READDIR)/g' \
-             -e 's/@''GNULIB_REWINDDIR''@/$(GNULIB_REWINDDIR)/g' \
-             -e 's/@''GNULIB_CLOSEDIR''@/$(GNULIB_CLOSEDIR)/g' \
-             -e 's/@''GNULIB_DIRFD''@/$(GNULIB_DIRFD)/g' \
-             -e 's/@''GNULIB_FDOPENDIR''@/$(GNULIB_FDOPENDIR)/g' \
-             -e 's/@''GNULIB_SCANDIR''@/$(GNULIB_SCANDIR)/g' \
-             -e 's/@''GNULIB_ALPHASORT''@/$(GNULIB_ALPHASORT)/g' \
+             -e 's/@''GNULIB_OPENDIR''@/$(GL_GNULIB_OPENDIR)/g' \
+             -e 's/@''GNULIB_READDIR''@/$(GL_GNULIB_READDIR)/g' \
+             -e 's/@''GNULIB_REWINDDIR''@/$(GL_GNULIB_REWINDDIR)/g' \
+             -e 's/@''GNULIB_CLOSEDIR''@/$(GL_GNULIB_CLOSEDIR)/g' \
+             -e 's/@''GNULIB_DIRFD''@/$(GL_GNULIB_DIRFD)/g' \
+             -e 's/@''GNULIB_FDOPENDIR''@/$(GL_GNULIB_FDOPENDIR)/g' \
+             -e 's/@''GNULIB_SCANDIR''@/$(GL_GNULIB_SCANDIR)/g' \
+             -e 's/@''GNULIB_ALPHASORT''@/$(GL_GNULIB_ALPHASORT)/g' \
              -e 's/@''HAVE_OPENDIR''@/$(HAVE_OPENDIR)/g' \
              -e 's/@''HAVE_READDIR''@/$(HAVE_READDIR)/g' \
              -e 's/@''HAVE_REWINDDIR''@/$(HAVE_REWINDDIR)/g' \
@@ -543,6 +543,32 @@ EXTRA_libgnu_la_SOURCES += duplocale.c
 ## begin gnulib module dynarray
 
 if gl_GNULIB_ENABLED_dynarray
+BUILT_SOURCES += malloc/dynarray.gl.h malloc/dynarray-skeleton.gl.h
+
+malloc/dynarray.gl.h: malloc/dynarray.h
+       $(AM_V_at)$(MKDIR_P) malloc
+       $(AM_V_GEN)rm -f $@-t $@ && \
+       { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
+         sed -e '/libc_hidden_proto/d' < $(srcdir)/malloc/dynarray.h; \
+       } > $@-t && \
+       mv $@-t $@
+MOSTLYCLEANFILES += malloc/dynarray.gl.h malloc/dynarray.gl.h-t
+
+malloc/dynarray-skeleton.gl.h: malloc/dynarray-skeleton.c
+       $(AM_V_at)$(MKDIR_P) malloc
+       $(AM_V_GEN)rm -f $@-t $@ && \
+       { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
+         sed -e 's|<malloc/dynarray\.h>|<malloc/dynarray.gl.h>|g' \
+             -e 's|__attribute_maybe_unused__|_GL_ATTRIBUTE_MAYBE_UNUSED|g' \
+             -e 's|__attribute_nonnull__|_GL_ATTRIBUTE_NONNULL|g' \
+             -e 's|__attribute_warn_unused_result__|_GL_ATTRIBUTE_NODISCARD|g' 
\
+             -e 's|__glibc_likely|_GL_LIKELY|g' \
+             -e 's|__glibc_unlikely|_GL_UNLIKELY|g' \
+             < $(srcdir)/malloc/dynarray-skeleton.c; \
+       } > $@-t && \
+       mv $@-t $@
+MOSTLYCLEANFILES += malloc/dynarray-skeleton.gl.h 
malloc/dynarray-skeleton.gl.h-t
+
 libgnu_la_SOURCES += malloc/dynarray_at_failure.c                 
malloc/dynarray_emplace_enlarge.c                 malloc/dynarray_finalize.c    
             malloc/dynarray_resize.c                 
malloc/dynarray_resize_clear.c
 
 endif
@@ -620,13 +646,13 @@ fcntl.h: fcntl.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H)
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_FCNTL_H''@|$(NEXT_FCNTL_H)|g' \
-             -e 's/@''GNULIB_CREAT''@/$(GNULIB_CREAT)/g' \
-             -e 's/@''GNULIB_FCNTL''@/$(GNULIB_FCNTL)/g' \
-             -e 's/@''GNULIB_NONBLOCKING''@/$(GNULIB_NONBLOCKING)/g' \
-             -e 's/@''GNULIB_OPEN''@/$(GNULIB_OPEN)/g' \
-             -e 's/@''GNULIB_OPENAT''@/$(GNULIB_OPENAT)/g' \
-             -e 's/@''GNULIB_MDA_CREAT''@/$(GNULIB_MDA_CREAT)/g' \
-             -e 's/@''GNULIB_MDA_OPEN''@/$(GNULIB_MDA_OPEN)/g' \
+             -e 's/@''GNULIB_CREAT''@/$(GL_GNULIB_CREAT)/g' \
+             -e 's/@''GNULIB_FCNTL''@/$(GL_GNULIB_FCNTL)/g' \
+             -e 's/@''GNULIB_NONBLOCKING''@/$(GL_GNULIB_NONBLOCKING)/g' \
+             -e 's/@''GNULIB_OPEN''@/$(GL_GNULIB_OPEN)/g' \
+             -e 's/@''GNULIB_OPENAT''@/$(GL_GNULIB_OPENAT)/g' \
+             -e 's/@''GNULIB_MDA_CREAT''@/$(GL_GNULIB_MDA_CREAT)/g' \
+             -e 's/@''GNULIB_MDA_OPEN''@/$(GL_GNULIB_MDA_OPEN)/g' \
              -e 's|@''HAVE_FCNTL''@|$(HAVE_FCNTL)|g' \
              -e 's|@''HAVE_OPENAT''@|$(HAVE_OPENAT)|g' \
              -e 's|@''REPLACE_CREAT''@|$(REPLACE_CREAT)|g' \
@@ -930,7 +956,7 @@ iconv.h: iconv.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H)
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_ICONV_H''@|$(NEXT_ICONV_H)|g' \
-             -e 's/@''GNULIB_ICONV''@/$(GNULIB_ICONV)/g' \
+             -e 's/@''GNULIB_ICONV''@/$(GL_GNULIB_ICONV)/g' \
              -e 's|@''ICONV_CONST''@|$(ICONV_CONST)|g' \
              -e 's|@''REPLACE_ICONV''@|$(REPLACE_ICONV)|g' \
              -e 's|@''REPLACE_ICONV_OPEN''@|$(REPLACE_ICONV_OPEN)|g' \
@@ -984,10 +1010,8 @@ EXTRA_libgnu_la_SOURCES += iconv.c iconv_close.c 
iconv_open.c
 
 ## begin gnulib module idx
 
-if gl_GNULIB_ENABLED_idx
 libgnu_la_SOURCES += idx.h
 
-endif
 ## end   gnulib module idx
 
 ## begin gnulib module inet_ntop
@@ -1031,10 +1055,10 @@ inttypes.h: inttypes.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(WARN_ON_U
              -e 's|@''NEXT_INTTYPES_H''@|$(NEXT_INTTYPES_H)|g' \
              -e 's/@''APPLE_UNIVERSAL_BUILD''@/$(APPLE_UNIVERSAL_BUILD)/g' \
              -e 's/@''PRIPTR_PREFIX''@/$(PRIPTR_PREFIX)/g' \
-             -e 's/@''GNULIB_IMAXABS''@/$(GNULIB_IMAXABS)/g' \
-             -e 's/@''GNULIB_IMAXDIV''@/$(GNULIB_IMAXDIV)/g' \
-             -e 's/@''GNULIB_STRTOIMAX''@/$(GNULIB_STRTOIMAX)/g' \
-             -e 's/@''GNULIB_STRTOUMAX''@/$(GNULIB_STRTOUMAX)/g' \
+             -e 's/@''GNULIB_IMAXABS''@/$(GL_GNULIB_IMAXABS)/g' \
+             -e 's/@''GNULIB_IMAXDIV''@/$(GL_GNULIB_IMAXDIV)/g' \
+             -e 's/@''GNULIB_STRTOIMAX''@/$(GL_GNULIB_STRTOIMAX)/g' \
+             -e 's/@''GNULIB_STRTOUMAX''@/$(GL_GNULIB_STRTOUMAX)/g' \
              -e 's/@''HAVE_DECL_IMAXABS''@/$(HAVE_DECL_IMAXABS)/g' \
              -e 's/@''HAVE_DECL_IMAXDIV''@/$(HAVE_DECL_IMAXDIV)/g' \
              -e 's/@''HAVE_DECL_STRTOIMAX''@/$(HAVE_DECL_STRTOIMAX)/g' \
@@ -1151,7 +1175,7 @@ langinfo.h: langinfo.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(WARN_ON_U
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_LANGINFO_H''@|$(NEXT_LANGINFO_H)|g' \
-             -e 's/@''GNULIB_NL_LANGINFO''@/$(GNULIB_NL_LANGINFO)/g' \
+             -e 's/@''GNULIB_NL_LANGINFO''@/$(GL_GNULIB_NL_LANGINFO)/g' \
              -e 's|@''HAVE_LANGINFO_CODESET''@|$(HAVE_LANGINFO_CODESET)|g' \
              -e 
's|@''HAVE_LANGINFO_T_FMT_AMPM''@|$(HAVE_LANGINFO_T_FMT_AMPM)|g' \
              -e 's|@''HAVE_LANGINFO_ALTMON''@|$(HAVE_LANGINFO_ALTMON)|g' \
@@ -1264,11 +1288,11 @@ locale.h: locale.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_LOCALE_H''@|$(NEXT_LOCALE_H)|g' \
-             -e 's/@''GNULIB_LOCALECONV''@/$(GNULIB_LOCALECONV)/g' \
-             -e 's/@''GNULIB_SETLOCALE''@/$(GNULIB_SETLOCALE)/g' \
-             -e 's/@''GNULIB_SETLOCALE_NULL''@/$(GNULIB_SETLOCALE_NULL)/g' \
-             -e 's/@''GNULIB_DUPLOCALE''@/$(GNULIB_DUPLOCALE)/g' \
-             -e 's/@''GNULIB_LOCALENAME''@/$(GNULIB_LOCALENAME)/g' \
+             -e 's/@''GNULIB_LOCALECONV''@/$(GL_GNULIB_LOCALECONV)/g' \
+             -e 's/@''GNULIB_SETLOCALE''@/$(GL_GNULIB_SETLOCALE)/g' \
+             -e 's/@''GNULIB_SETLOCALE_NULL''@/$(GL_GNULIB_SETLOCALE_NULL)/g' \
+             -e 's/@''GNULIB_DUPLOCALE''@/$(GL_GNULIB_DUPLOCALE)/g' \
+             -e 's/@''GNULIB_LOCALENAME''@/$(GL_GNULIB_LOCALENAME)/g' \
              -e 's|@''HAVE_NEWLOCALE''@|$(HAVE_NEWLOCALE)|g' \
              -e 's|@''HAVE_DUPLOCALE''@|$(HAVE_DUPLOCALE)|g' \
              -e 's|@''HAVE_FREELOCALE''@|$(HAVE_FREELOCALE)|g' \
@@ -1379,108 +1403,108 @@ math.h: math.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H) $(
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 
's|@''NEXT_AS_FIRST_DIRECTIVE_MATH_H''@|$(NEXT_AS_FIRST_DIRECTIVE_MATH_H)|g' \
-             -e 's/@''GNULIB_ACOSF''@/$(GNULIB_ACOSF)/g' \
-             -e 's/@''GNULIB_ACOSL''@/$(GNULIB_ACOSL)/g' \
-             -e 's/@''GNULIB_ASINF''@/$(GNULIB_ASINF)/g' \
-             -e 's/@''GNULIB_ASINL''@/$(GNULIB_ASINL)/g' \
-             -e 's/@''GNULIB_ATANF''@/$(GNULIB_ATANF)/g' \
-             -e 's/@''GNULIB_ATANL''@/$(GNULIB_ATANL)/g' \
-             -e 's/@''GNULIB_ATAN2F''@/$(GNULIB_ATAN2F)/g' \
-             -e 's/@''GNULIB_CBRT''@/$(GNULIB_CBRT)/g' \
-             -e 's/@''GNULIB_CBRTF''@/$(GNULIB_CBRTF)/g' \
-             -e 's/@''GNULIB_CBRTL''@/$(GNULIB_CBRTL)/g' \
-             -e 's/@''GNULIB_CEIL''@/$(GNULIB_CEIL)/g' \
-             -e 's/@''GNULIB_CEILF''@/$(GNULIB_CEILF)/g' \
-             -e 's/@''GNULIB_CEILL''@/$(GNULIB_CEILL)/g' \
-             -e 's/@''GNULIB_COPYSIGN''@/$(GNULIB_COPYSIGN)/g' \
-             -e 's/@''GNULIB_COPYSIGNF''@/$(GNULIB_COPYSIGNF)/g' \
-             -e 's/@''GNULIB_COPYSIGNL''@/$(GNULIB_COPYSIGNL)/g' \
-             -e 's/@''GNULIB_COSF''@/$(GNULIB_COSF)/g' \
-             -e 's/@''GNULIB_COSL''@/$(GNULIB_COSL)/g' \
-             -e 's/@''GNULIB_COSHF''@/$(GNULIB_COSHF)/g' \
-             -e 's/@''GNULIB_EXPF''@/$(GNULIB_EXPF)/g' \
-             -e 's/@''GNULIB_EXPL''@/$(GNULIB_EXPL)/g' \
-             -e 's/@''GNULIB_EXP2''@/$(GNULIB_EXP2)/g' \
-             -e 's/@''GNULIB_EXP2F''@/$(GNULIB_EXP2F)/g' \
-             -e 's/@''GNULIB_EXP2L''@/$(GNULIB_EXP2L)/g' \
-             -e 's/@''GNULIB_EXPM1''@/$(GNULIB_EXPM1)/g' \
-             -e 's/@''GNULIB_EXPM1F''@/$(GNULIB_EXPM1F)/g' \
-             -e 's/@''GNULIB_EXPM1L''@/$(GNULIB_EXPM1L)/g' \
-             -e 's/@''GNULIB_FABSF''@/$(GNULIB_FABSF)/g' \
-             -e 's/@''GNULIB_FABSL''@/$(GNULIB_FABSL)/g' \
-             -e 's/@''GNULIB_FLOOR''@/$(GNULIB_FLOOR)/g' \
-             -e 's/@''GNULIB_FLOORF''@/$(GNULIB_FLOORF)/g' \
-             -e 's/@''GNULIB_FLOORL''@/$(GNULIB_FLOORL)/g' \
-             -e 's/@''GNULIB_FMA''@/$(GNULIB_FMA)/g' \
-             -e 's/@''GNULIB_FMAF''@/$(GNULIB_FMAF)/g' \
-             -e 's/@''GNULIB_FMAL''@/$(GNULIB_FMAL)/g' \
-             -e 's/@''GNULIB_FMOD''@/$(GNULIB_FMOD)/g' \
-             -e 's/@''GNULIB_FMODF''@/$(GNULIB_FMODF)/g' \
-             -e 's/@''GNULIB_FMODL''@/$(GNULIB_FMODL)/g' \
-             -e 's/@''GNULIB_FREXPF''@/$(GNULIB_FREXPF)/g' \
-             -e 's/@''GNULIB_FREXP''@/$(GNULIB_FREXP)/g' \
-             -e 's/@''GNULIB_FREXPL''@/$(GNULIB_FREXPL)/g' \
-             -e 's/@''GNULIB_HYPOT''@/$(GNULIB_HYPOT)/g' \
-             -e 's/@''GNULIB_HYPOTF''@/$(GNULIB_HYPOTF)/g' \
-             -e 's/@''GNULIB_HYPOTL''@/$(GNULIB_HYPOTL)/g' \
+             -e 's/@''GNULIB_ACOSF''@/$(GL_GNULIB_ACOSF)/g' \
+             -e 's/@''GNULIB_ACOSL''@/$(GL_GNULIB_ACOSL)/g' \
+             -e 's/@''GNULIB_ASINF''@/$(GL_GNULIB_ASINF)/g' \
+             -e 's/@''GNULIB_ASINL''@/$(GL_GNULIB_ASINL)/g' \
+             -e 's/@''GNULIB_ATANF''@/$(GL_GNULIB_ATANF)/g' \
+             -e 's/@''GNULIB_ATANL''@/$(GL_GNULIB_ATANL)/g' \
+             -e 's/@''GNULIB_ATAN2F''@/$(GL_GNULIB_ATAN2F)/g' \
+             -e 's/@''GNULIB_CBRT''@/$(GL_GNULIB_CBRT)/g' \
+             -e 's/@''GNULIB_CBRTF''@/$(GL_GNULIB_CBRTF)/g' \
+             -e 's/@''GNULIB_CBRTL''@/$(GL_GNULIB_CBRTL)/g' \
+             -e 's/@''GNULIB_CEIL''@/$(GL_GNULIB_CEIL)/g' \
+             -e 's/@''GNULIB_CEILF''@/$(GL_GNULIB_CEILF)/g' \
+             -e 's/@''GNULIB_CEILL''@/$(GL_GNULIB_CEILL)/g' \
+             -e 's/@''GNULIB_COPYSIGN''@/$(GL_GNULIB_COPYSIGN)/g' \
+             -e 's/@''GNULIB_COPYSIGNF''@/$(GL_GNULIB_COPYSIGNF)/g' \
+             -e 's/@''GNULIB_COPYSIGNL''@/$(GL_GNULIB_COPYSIGNL)/g' \
+             -e 's/@''GNULIB_COSF''@/$(GL_GNULIB_COSF)/g' \
+             -e 's/@''GNULIB_COSL''@/$(GL_GNULIB_COSL)/g' \
+             -e 's/@''GNULIB_COSHF''@/$(GL_GNULIB_COSHF)/g' \
+             -e 's/@''GNULIB_EXPF''@/$(GL_GNULIB_EXPF)/g' \
+             -e 's/@''GNULIB_EXPL''@/$(GL_GNULIB_EXPL)/g' \
+             -e 's/@''GNULIB_EXP2''@/$(GL_GNULIB_EXP2)/g' \
+             -e 's/@''GNULIB_EXP2F''@/$(GL_GNULIB_EXP2F)/g' \
+             -e 's/@''GNULIB_EXP2L''@/$(GL_GNULIB_EXP2L)/g' \
+             -e 's/@''GNULIB_EXPM1''@/$(GL_GNULIB_EXPM1)/g' \
+             -e 's/@''GNULIB_EXPM1F''@/$(GL_GNULIB_EXPM1F)/g' \
+             -e 's/@''GNULIB_EXPM1L''@/$(GL_GNULIB_EXPM1L)/g' \
+             -e 's/@''GNULIB_FABSF''@/$(GL_GNULIB_FABSF)/g' \
+             -e 's/@''GNULIB_FABSL''@/$(GL_GNULIB_FABSL)/g' \
+             -e 's/@''GNULIB_FLOOR''@/$(GL_GNULIB_FLOOR)/g' \
+             -e 's/@''GNULIB_FLOORF''@/$(GL_GNULIB_FLOORF)/g' \
+             -e 's/@''GNULIB_FLOORL''@/$(GL_GNULIB_FLOORL)/g' \
+             -e 's/@''GNULIB_FMA''@/$(GL_GNULIB_FMA)/g' \
+             -e 's/@''GNULIB_FMAF''@/$(GL_GNULIB_FMAF)/g' \
+             -e 's/@''GNULIB_FMAL''@/$(GL_GNULIB_FMAL)/g' \
+             -e 's/@''GNULIB_FMOD''@/$(GL_GNULIB_FMOD)/g' \
+             -e 's/@''GNULIB_FMODF''@/$(GL_GNULIB_FMODF)/g' \
+             -e 's/@''GNULIB_FMODL''@/$(GL_GNULIB_FMODL)/g' \
+             -e 's/@''GNULIB_FREXPF''@/$(GL_GNULIB_FREXPF)/g' \
+             -e 's/@''GNULIB_FREXP''@/$(GL_GNULIB_FREXP)/g' \
+             -e 's/@''GNULIB_FREXPL''@/$(GL_GNULIB_FREXPL)/g' \
+             -e 's/@''GNULIB_HYPOT''@/$(GL_GNULIB_HYPOT)/g' \
+             -e 's/@''GNULIB_HYPOTF''@/$(GL_GNULIB_HYPOTF)/g' \
+             -e 's/@''GNULIB_HYPOTL''@/$(GL_GNULIB_HYPOTL)/g' \
              < $(srcdir)/math.in.h | \
-         sed -e 's/@''GNULIB_ILOGB''@/$(GNULIB_ILOGB)/g' \
-             -e 's/@''GNULIB_ILOGBF''@/$(GNULIB_ILOGBF)/g' \
-             -e 's/@''GNULIB_ILOGBL''@/$(GNULIB_ILOGBL)/g' \
-             -e 's/@''GNULIB_ISFINITE''@/$(GNULIB_ISFINITE)/g' \
-             -e 's/@''GNULIB_ISINF''@/$(GNULIB_ISINF)/g' \
-             -e 's/@''GNULIB_ISNAN''@/$(GNULIB_ISNAN)/g' \
-             -e 's/@''GNULIB_ISNANF''@/$(GNULIB_ISNANF)/g' \
-             -e 's/@''GNULIB_ISNAND''@/$(GNULIB_ISNAND)/g' \
-             -e 's/@''GNULIB_ISNANL''@/$(GNULIB_ISNANL)/g' \
-             -e 's/@''GNULIB_LDEXPF''@/$(GNULIB_LDEXPF)/g' \
-             -e 's/@''GNULIB_LDEXPL''@/$(GNULIB_LDEXPL)/g' \
-             -e 's/@''GNULIB_LOG''@/$(GNULIB_LOG)/g' \
-             -e 's/@''GNULIB_LOGF''@/$(GNULIB_LOGF)/g' \
-             -e 's/@''GNULIB_LOGL''@/$(GNULIB_LOGL)/g' \
-             -e 's/@''GNULIB_LOG10''@/$(GNULIB_LOG10)/g' \
-             -e 's/@''GNULIB_LOG10F''@/$(GNULIB_LOG10F)/g' \
-             -e 's/@''GNULIB_LOG10L''@/$(GNULIB_LOG10L)/g' \
-             -e 's/@''GNULIB_LOG1P''@/$(GNULIB_LOG1P)/g' \
-             -e 's/@''GNULIB_LOG1PF''@/$(GNULIB_LOG1PF)/g' \
-             -e 's/@''GNULIB_LOG1PL''@/$(GNULIB_LOG1PL)/g' \
-             -e 's/@''GNULIB_LOG2''@/$(GNULIB_LOG2)/g' \
-             -e 's/@''GNULIB_LOG2F''@/$(GNULIB_LOG2F)/g' \
-             -e 's/@''GNULIB_LOG2L''@/$(GNULIB_LOG2L)/g' \
-             -e 's/@''GNULIB_LOGB''@/$(GNULIB_LOGB)/g' \
-             -e 's/@''GNULIB_LOGBF''@/$(GNULIB_LOGBF)/g' \
-             -e 's/@''GNULIB_LOGBL''@/$(GNULIB_LOGBL)/g' \
-             -e 's/@''GNULIB_MODF''@/$(GNULIB_MODF)/g' \
-             -e 's/@''GNULIB_MODFF''@/$(GNULIB_MODFF)/g' \
-             -e 's/@''GNULIB_MODFL''@/$(GNULIB_MODFL)/g' \
-             -e 's/@''GNULIB_POWF''@/$(GNULIB_POWF)/g' \
-             -e 's/@''GNULIB_REMAINDER''@/$(GNULIB_REMAINDER)/g' \
-             -e 's/@''GNULIB_REMAINDERF''@/$(GNULIB_REMAINDERF)/g' \
-             -e 's/@''GNULIB_REMAINDERL''@/$(GNULIB_REMAINDERL)/g' \
-             -e 's/@''GNULIB_RINT''@/$(GNULIB_RINT)/g' \
-             -e 's/@''GNULIB_RINTF''@/$(GNULIB_RINTF)/g' \
-             -e 's/@''GNULIB_RINTL''@/$(GNULIB_RINTL)/g' \
-             -e 's/@''GNULIB_ROUND''@/$(GNULIB_ROUND)/g' \
-             -e 's/@''GNULIB_ROUNDF''@/$(GNULIB_ROUNDF)/g' \
-             -e 's/@''GNULIB_ROUNDL''@/$(GNULIB_ROUNDL)/g' \
-             -e 's/@''GNULIB_SIGNBIT''@/$(GNULIB_SIGNBIT)/g' \
-             -e 's/@''GNULIB_SINF''@/$(GNULIB_SINF)/g' \
-             -e 's/@''GNULIB_SINL''@/$(GNULIB_SINL)/g' \
-             -e 's/@''GNULIB_SINHF''@/$(GNULIB_SINHF)/g' \
-             -e 's/@''GNULIB_SQRTF''@/$(GNULIB_SQRTF)/g' \
-             -e 's/@''GNULIB_SQRTL''@/$(GNULIB_SQRTL)/g' \
-             -e 's/@''GNULIB_TANF''@/$(GNULIB_TANF)/g' \
-             -e 's/@''GNULIB_TANL''@/$(GNULIB_TANL)/g' \
-             -e 's/@''GNULIB_TANHF''@/$(GNULIB_TANHF)/g' \
-             -e 's/@''GNULIB_TRUNC''@/$(GNULIB_TRUNC)/g' \
-             -e 's/@''GNULIB_TRUNCF''@/$(GNULIB_TRUNCF)/g' \
-             -e 's/@''GNULIB_TRUNCL''@/$(GNULIB_TRUNCL)/g' \
-             -e 's/@''GNULIB_MDA_J0''@/$(GNULIB_MDA_J0)/g' \
-             -e 's/@''GNULIB_MDA_J1''@/$(GNULIB_MDA_J1)/g' \
-             -e 's/@''GNULIB_MDA_JN''@/$(GNULIB_MDA_JN)/g' \
-             -e 's/@''GNULIB_MDA_Y0''@/$(GNULIB_MDA_Y0)/g' \
-             -e 's/@''GNULIB_MDA_Y1''@/$(GNULIB_MDA_Y1)/g' \
-             -e 's/@''GNULIB_MDA_YN''@/$(GNULIB_MDA_YN)/g' \
+         sed -e 's/@''GNULIB_ILOGB''@/$(GL_GNULIB_ILOGB)/g' \
+             -e 's/@''GNULIB_ILOGBF''@/$(GL_GNULIB_ILOGBF)/g' \
+             -e 's/@''GNULIB_ILOGBL''@/$(GL_GNULIB_ILOGBL)/g' \
+             -e 's/@''GNULIB_ISFINITE''@/$(GL_GNULIB_ISFINITE)/g' \
+             -e 's/@''GNULIB_ISINF''@/$(GL_GNULIB_ISINF)/g' \
+             -e 's/@''GNULIB_ISNAN''@/$(GL_GNULIB_ISNAN)/g' \
+             -e 's/@''GNULIB_ISNANF''@/$(GL_GNULIB_ISNANF)/g' \
+             -e 's/@''GNULIB_ISNAND''@/$(GL_GNULIB_ISNAND)/g' \
+             -e 's/@''GNULIB_ISNANL''@/$(GL_GNULIB_ISNANL)/g' \
+             -e 's/@''GNULIB_LDEXPF''@/$(GL_GNULIB_LDEXPF)/g' \
+             -e 's/@''GNULIB_LDEXPL''@/$(GL_GNULIB_LDEXPL)/g' \
+             -e 's/@''GNULIB_LOG''@/$(GL_GNULIB_LOG)/g' \
+             -e 's/@''GNULIB_LOGF''@/$(GL_GNULIB_LOGF)/g' \
+             -e 's/@''GNULIB_LOGL''@/$(GL_GNULIB_LOGL)/g' \
+             -e 's/@''GNULIB_LOG10''@/$(GL_GNULIB_LOG10)/g' \
+             -e 's/@''GNULIB_LOG10F''@/$(GL_GNULIB_LOG10F)/g' \
+             -e 's/@''GNULIB_LOG10L''@/$(GL_GNULIB_LOG10L)/g' \
+             -e 's/@''GNULIB_LOG1P''@/$(GL_GNULIB_LOG1P)/g' \
+             -e 's/@''GNULIB_LOG1PF''@/$(GL_GNULIB_LOG1PF)/g' \
+             -e 's/@''GNULIB_LOG1PL''@/$(GL_GNULIB_LOG1PL)/g' \
+             -e 's/@''GNULIB_LOG2''@/$(GL_GNULIB_LOG2)/g' \
+             -e 's/@''GNULIB_LOG2F''@/$(GL_GNULIB_LOG2F)/g' \
+             -e 's/@''GNULIB_LOG2L''@/$(GL_GNULIB_LOG2L)/g' \
+             -e 's/@''GNULIB_LOGB''@/$(GL_GNULIB_LOGB)/g' \
+             -e 's/@''GNULIB_LOGBF''@/$(GL_GNULIB_LOGBF)/g' \
+             -e 's/@''GNULIB_LOGBL''@/$(GL_GNULIB_LOGBL)/g' \
+             -e 's/@''GNULIB_MODF''@/$(GL_GNULIB_MODF)/g' \
+             -e 's/@''GNULIB_MODFF''@/$(GL_GNULIB_MODFF)/g' \
+             -e 's/@''GNULIB_MODFL''@/$(GL_GNULIB_MODFL)/g' \
+             -e 's/@''GNULIB_POWF''@/$(GL_GNULIB_POWF)/g' \
+             -e 's/@''GNULIB_REMAINDER''@/$(GL_GNULIB_REMAINDER)/g' \
+             -e 's/@''GNULIB_REMAINDERF''@/$(GL_GNULIB_REMAINDERF)/g' \
+             -e 's/@''GNULIB_REMAINDERL''@/$(GL_GNULIB_REMAINDERL)/g' \
+             -e 's/@''GNULIB_RINT''@/$(GL_GNULIB_RINT)/g' \
+             -e 's/@''GNULIB_RINTF''@/$(GL_GNULIB_RINTF)/g' \
+             -e 's/@''GNULIB_RINTL''@/$(GL_GNULIB_RINTL)/g' \
+             -e 's/@''GNULIB_ROUND''@/$(GL_GNULIB_ROUND)/g' \
+             -e 's/@''GNULIB_ROUNDF''@/$(GL_GNULIB_ROUNDF)/g' \
+             -e 's/@''GNULIB_ROUNDL''@/$(GL_GNULIB_ROUNDL)/g' \
+             -e 's/@''GNULIB_SIGNBIT''@/$(GL_GNULIB_SIGNBIT)/g' \
+             -e 's/@''GNULIB_SINF''@/$(GL_GNULIB_SINF)/g' \
+             -e 's/@''GNULIB_SINL''@/$(GL_GNULIB_SINL)/g' \
+             -e 's/@''GNULIB_SINHF''@/$(GL_GNULIB_SINHF)/g' \
+             -e 's/@''GNULIB_SQRTF''@/$(GL_GNULIB_SQRTF)/g' \
+             -e 's/@''GNULIB_SQRTL''@/$(GL_GNULIB_SQRTL)/g' \
+             -e 's/@''GNULIB_TANF''@/$(GL_GNULIB_TANF)/g' \
+             -e 's/@''GNULIB_TANL''@/$(GL_GNULIB_TANL)/g' \
+             -e 's/@''GNULIB_TANHF''@/$(GL_GNULIB_TANHF)/g' \
+             -e 's/@''GNULIB_TRUNC''@/$(GL_GNULIB_TRUNC)/g' \
+             -e 's/@''GNULIB_TRUNCF''@/$(GL_GNULIB_TRUNCF)/g' \
+             -e 's/@''GNULIB_TRUNCL''@/$(GL_GNULIB_TRUNCL)/g' \
+             -e 's/@''GNULIB_MDA_J0''@/$(GL_GNULIB_MDA_J0)/g' \
+             -e 's/@''GNULIB_MDA_J1''@/$(GL_GNULIB_MDA_J1)/g' \
+             -e 's/@''GNULIB_MDA_JN''@/$(GL_GNULIB_MDA_JN)/g' \
+             -e 's/@''GNULIB_MDA_Y0''@/$(GL_GNULIB_MDA_Y0)/g' \
+             -e 's/@''GNULIB_MDA_Y1''@/$(GL_GNULIB_MDA_Y1)/g' \
+             -e 's/@''GNULIB_MDA_YN''@/$(GL_GNULIB_MDA_YN)/g' \
          | \
          sed -e 's|@''HAVE_ACOSF''@|$(HAVE_ACOSF)|g' \
              -e 's|@''HAVE_ACOSL''@|$(HAVE_ACOSL)|g' \
@@ -1804,7 +1828,7 @@ netdb.h: netdb.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H)
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_NETDB_H''@|$(NEXT_NETDB_H)|g' \
              -e 's|@''HAVE_NETDB_H''@|$(HAVE_NETDB_H)|g' \
-             -e 's/@''GNULIB_GETADDRINFO''@/$(GNULIB_GETADDRINFO)/g' \
+             -e 's/@''GNULIB_GETADDRINFO''@/$(GL_GNULIB_GETADDRINFO)/g' \
              -e 's|@''HAVE_STRUCT_ADDRINFO''@|$(HAVE_STRUCT_ADDRINFO)|g' \
              -e 's|@''HAVE_DECL_FREEADDRINFO''@|$(HAVE_DECL_FREEADDRINFO)|g' \
              -e 's|@''HAVE_DECL_GAI_STRERROR''@|$(HAVE_DECL_GAI_STRERROR)|g' \
@@ -1937,7 +1961,7 @@ poll.h: poll.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(WARN_ON_USE_H)
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_POLL_H''@|$(NEXT_POLL_H)|g' \
-             -e 's/@''GNULIB_POLL''@/$(GNULIB_POLL)/g' \
+             -e 's/@''GNULIB_POLL''@/$(GL_GNULIB_POLL)/g' \
              -e 's|@''HAVE_WINSOCK2_H''@|$(HAVE_WINSOCK2_H)|g' \
              -e 's|@''HAVE_POLL''@|$(HAVE_POLL)|g' \
              -e 's|@''REPLACE_POLL''@|$(REPLACE_POLL)|g' \
@@ -2098,6 +2122,21 @@ EXTRA_DIST += same-inode.h
 ## begin gnulib module scratch_buffer
 
 if gl_GNULIB_ENABLED_scratch_buffer
+BUILT_SOURCES += malloc/scratch_buffer.gl.h
+
+malloc/scratch_buffer.gl.h: malloc/scratch_buffer.h
+       $(AM_V_at)$(MKDIR_P) malloc
+       $(AM_V_GEN)rm -f $@-t $@ && \
+       { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
+         sed -e 's|__always_inline|inline _GL_ATTRIBUTE_ALWAYS_INLINE|g' \
+             -e 's|__glibc_likely|_GL_LIKELY|g' \
+             -e 's|__glibc_unlikely|_GL_UNLIKELY|g' \
+             -e '/libc_hidden_proto/d' \
+             < $(srcdir)/malloc/scratch_buffer.h; \
+       } > $@-t && \
+       mv $@-t $@
+MOSTLYCLEANFILES += malloc/scratch_buffer.gl.h malloc/scratch_buffer.gl.h-t
+
 libgnu_la_SOURCES += malloc/scratch_buffer_dupfree.c                 
malloc/scratch_buffer_grow.c                 
malloc/scratch_buffer_grow_preserve.c                 
malloc/scratch_buffer_set_array_size.c
 
 endif
@@ -2185,11 +2224,11 @@ signal.h: signal.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_SIGNAL_H''@|$(NEXT_SIGNAL_H)|g' \
-             -e 's/@''GNULIB_PTHREAD_SIGMASK''@/$(GNULIB_PTHREAD_SIGMASK)/g' \
-             -e 's/@''GNULIB_RAISE''@/$(GNULIB_RAISE)/g' \
-             -e 's/@''GNULIB_SIGNAL_H_SIGPIPE''@/$(GNULIB_SIGNAL_H_SIGPIPE)/g' 
\
-             -e 's/@''GNULIB_SIGPROCMASK''@/$(GNULIB_SIGPROCMASK)/g' \
-             -e 's/@''GNULIB_SIGACTION''@/$(GNULIB_SIGACTION)/g' \
+             -e 
's/@''GNULIB_PTHREAD_SIGMASK''@/$(GL_GNULIB_PTHREAD_SIGMASK)/g' \
+             -e 's/@''GNULIB_RAISE''@/$(GL_GNULIB_RAISE)/g' \
+             -e 
's/@''GNULIB_SIGNAL_H_SIGPIPE''@/$(GL_GNULIB_SIGNAL_H_SIGPIPE)/g' \
+             -e 's/@''GNULIB_SIGPROCMASK''@/$(GL_GNULIB_SIGPROCMASK)/g' \
+             -e 's/@''GNULIB_SIGACTION''@/$(GL_GNULIB_SIGACTION)/g' \
              -e 
's|@''HAVE_POSIX_SIGNALBLOCKING''@|$(HAVE_POSIX_SIGNALBLOCKING)|g' \
              -e 's|@''HAVE_PTHREAD_SIGMASK''@|$(HAVE_PTHREAD_SIGMASK)|g' \
              -e 's|@''HAVE_RAISE''@|$(HAVE_RAISE)|g' \
@@ -2442,7 +2481,7 @@ stdint.h: stdint.in.h $(top_builddir)/config.status
              -e 's/@''BITSIZEOF_WINT_T''@/$(BITSIZEOF_WINT_T)/g' \
              -e 's/@''HAVE_SIGNED_WINT_T''@/$(HAVE_SIGNED_WINT_T)/g' \
              -e 's/@''WINT_T_SUFFIX''@/$(WINT_T_SUFFIX)/g' \
-             -e 's/@''GNULIB_OVERRIDES_WINT_T''@/$(GNULIB_OVERRIDES_WINT_T)/g' 
\
+             -e 
's/@''GNULIBHEADERS_OVERRIDE_WINT_T''@/$(GNULIBHEADERS_OVERRIDE_WINT_T)/g' \
              < $(srcdir)/stdint.in.h; \
        } > $@-t && \
        mv $@-t $@
@@ -2470,65 +2509,65 @@ stdio.h: stdio.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H)
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_STDIO_H''@|$(NEXT_STDIO_H)|g' \
-             -e 's/@''GNULIB_DPRINTF''@/$(GNULIB_DPRINTF)/g' \
-             -e 's/@''GNULIB_FCLOSE''@/$(GNULIB_FCLOSE)/g' \
-             -e 's/@''GNULIB_FDOPEN''@/$(GNULIB_FDOPEN)/g' \
-             -e 's/@''GNULIB_FFLUSH''@/$(GNULIB_FFLUSH)/g' \
-             -e 's/@''GNULIB_FGETC''@/$(GNULIB_FGETC)/g' \
-             -e 's/@''GNULIB_FGETS''@/$(GNULIB_FGETS)/g' \
-             -e 's/@''GNULIB_FOPEN''@/$(GNULIB_FOPEN)/g' \
-             -e 's/@''GNULIB_FPRINTF''@/$(GNULIB_FPRINTF)/g' \
-             -e 's/@''GNULIB_FPRINTF_POSIX''@/$(GNULIB_FPRINTF_POSIX)/g' \
-             -e 's/@''GNULIB_FPURGE''@/$(GNULIB_FPURGE)/g' \
-             -e 's/@''GNULIB_FPUTC''@/$(GNULIB_FPUTC)/g' \
-             -e 's/@''GNULIB_FPUTS''@/$(GNULIB_FPUTS)/g' \
-             -e 's/@''GNULIB_FREAD''@/$(GNULIB_FREAD)/g' \
-             -e 's/@''GNULIB_FREOPEN''@/$(GNULIB_FREOPEN)/g' \
-             -e 's/@''GNULIB_FSCANF''@/$(GNULIB_FSCANF)/g' \
-             -e 's/@''GNULIB_FSEEK''@/$(GNULIB_FSEEK)/g' \
-             -e 's/@''GNULIB_FSEEKO''@/$(GNULIB_FSEEKO)/g' \
-             -e 's/@''GNULIB_FTELL''@/$(GNULIB_FTELL)/g' \
-             -e 's/@''GNULIB_FTELLO''@/$(GNULIB_FTELLO)/g' \
-             -e 's/@''GNULIB_FWRITE''@/$(GNULIB_FWRITE)/g' \
-             -e 's/@''GNULIB_GETC''@/$(GNULIB_GETC)/g' \
-             -e 's/@''GNULIB_GETCHAR''@/$(GNULIB_GETCHAR)/g' \
-             -e 's/@''GNULIB_GETDELIM''@/$(GNULIB_GETDELIM)/g' \
-             -e 's/@''GNULIB_GETLINE''@/$(GNULIB_GETLINE)/g' \
-             -e 's/@''GNULIB_OBSTACK_PRINTF''@/$(GNULIB_OBSTACK_PRINTF)/g' \
-             -e 
's/@''GNULIB_OBSTACK_PRINTF_POSIX''@/$(GNULIB_OBSTACK_PRINTF_POSIX)/g' \
-             -e 's/@''GNULIB_PCLOSE''@/$(GNULIB_PCLOSE)/g' \
-             -e 's/@''GNULIB_PERROR''@/$(GNULIB_PERROR)/g' \
-             -e 's/@''GNULIB_POPEN''@/$(GNULIB_POPEN)/g' \
-             -e 's/@''GNULIB_PRINTF''@/$(GNULIB_PRINTF)/g' \
-             -e 's/@''GNULIB_PRINTF_POSIX''@/$(GNULIB_PRINTF_POSIX)/g' \
-             -e 's/@''GNULIB_PUTC''@/$(GNULIB_PUTC)/g' \
-             -e 's/@''GNULIB_PUTCHAR''@/$(GNULIB_PUTCHAR)/g' \
-             -e 's/@''GNULIB_PUTS''@/$(GNULIB_PUTS)/g' \
-             -e 's/@''GNULIB_REMOVE''@/$(GNULIB_REMOVE)/g' \
-             -e 's/@''GNULIB_RENAME''@/$(GNULIB_RENAME)/g' \
-             -e 's/@''GNULIB_RENAMEAT''@/$(GNULIB_RENAMEAT)/g' \
-             -e 's/@''GNULIB_SCANF''@/$(GNULIB_SCANF)/g' \
-             -e 's/@''GNULIB_SNPRINTF''@/$(GNULIB_SNPRINTF)/g' \
-             -e 's/@''GNULIB_SPRINTF_POSIX''@/$(GNULIB_SPRINTF_POSIX)/g' \
-             -e 
's/@''GNULIB_STDIO_H_NONBLOCKING''@/$(GNULIB_STDIO_H_NONBLOCKING)/g' \
-             -e 's/@''GNULIB_STDIO_H_SIGPIPE''@/$(GNULIB_STDIO_H_SIGPIPE)/g' \
-             -e 's/@''GNULIB_TMPFILE''@/$(GNULIB_TMPFILE)/g' \
-             -e 's/@''GNULIB_VASPRINTF''@/$(GNULIB_VASPRINTF)/g' \
-             -e 's/@''GNULIB_VDPRINTF''@/$(GNULIB_VDPRINTF)/g' \
-             -e 's/@''GNULIB_VFPRINTF''@/$(GNULIB_VFPRINTF)/g' \
-             -e 's/@''GNULIB_VFPRINTF_POSIX''@/$(GNULIB_VFPRINTF_POSIX)/g' \
-             -e 's/@''GNULIB_VFSCANF''@/$(GNULIB_VFSCANF)/g' \
-             -e 's/@''GNULIB_VSCANF''@/$(GNULIB_VSCANF)/g' \
-             -e 's/@''GNULIB_VPRINTF''@/$(GNULIB_VPRINTF)/g' \
-             -e 's/@''GNULIB_VPRINTF_POSIX''@/$(GNULIB_VPRINTF_POSIX)/g' \
-             -e 's/@''GNULIB_VSNPRINTF''@/$(GNULIB_VSNPRINTF)/g' \
-             -e 's/@''GNULIB_VSPRINTF_POSIX''@/$(GNULIB_VSPRINTF_POSIX)/g' \
-             -e 's/@''GNULIB_MDA_FCLOSEALL''@/$(GNULIB_MDA_FCLOSEALL)/g' \
-             -e 's/@''GNULIB_MDA_FDOPEN''@/$(GNULIB_MDA_FDOPEN)/g' \
-             -e 's/@''GNULIB_MDA_FILENO''@/$(GNULIB_MDA_FILENO)/g' \
-             -e 's/@''GNULIB_MDA_GETW''@/$(GNULIB_MDA_GETW)/g' \
-             -e 's/@''GNULIB_MDA_PUTW''@/$(GNULIB_MDA_PUTW)/g' \
-             -e 's/@''GNULIB_MDA_TEMPNAM''@/$(GNULIB_MDA_TEMPNAM)/g' \
+             -e 's/@''GNULIB_DPRINTF''@/$(GL_GNULIB_DPRINTF)/g' \
+             -e 's/@''GNULIB_FCLOSE''@/$(GL_GNULIB_FCLOSE)/g' \
+             -e 's/@''GNULIB_FDOPEN''@/$(GL_GNULIB_FDOPEN)/g' \
+             -e 's/@''GNULIB_FFLUSH''@/$(GL_GNULIB_FFLUSH)/g' \
+             -e 's/@''GNULIB_FGETC''@/$(GL_GNULIB_FGETC)/g' \
+             -e 's/@''GNULIB_FGETS''@/$(GL_GNULIB_FGETS)/g' \
+             -e 's/@''GNULIB_FOPEN''@/$(GL_GNULIB_FOPEN)/g' \
+             -e 's/@''GNULIB_FPRINTF''@/$(GL_GNULIB_FPRINTF)/g' \
+             -e 's/@''GNULIB_FPRINTF_POSIX''@/$(GL_GNULIB_FPRINTF_POSIX)/g' \
+             -e 's/@''GNULIB_FPURGE''@/$(GL_GNULIB_FPURGE)/g' \
+             -e 's/@''GNULIB_FPUTC''@/$(GL_GNULIB_FPUTC)/g' \
+             -e 's/@''GNULIB_FPUTS''@/$(GL_GNULIB_FPUTS)/g' \
+             -e 's/@''GNULIB_FREAD''@/$(GL_GNULIB_FREAD)/g' \
+             -e 's/@''GNULIB_FREOPEN''@/$(GL_GNULIB_FREOPEN)/g' \
+             -e 's/@''GNULIB_FSCANF''@/$(GL_GNULIB_FSCANF)/g' \
+             -e 's/@''GNULIB_FSEEK''@/$(GL_GNULIB_FSEEK)/g' \
+             -e 's/@''GNULIB_FSEEKO''@/$(GL_GNULIB_FSEEKO)/g' \
+             -e 's/@''GNULIB_FTELL''@/$(GL_GNULIB_FTELL)/g' \
+             -e 's/@''GNULIB_FTELLO''@/$(GL_GNULIB_FTELLO)/g' \
+             -e 's/@''GNULIB_FWRITE''@/$(GL_GNULIB_FWRITE)/g' \
+             -e 's/@''GNULIB_GETC''@/$(GL_GNULIB_GETC)/g' \
+             -e 's/@''GNULIB_GETCHAR''@/$(GL_GNULIB_GETCHAR)/g' \
+             -e 's/@''GNULIB_GETDELIM''@/$(GL_GNULIB_GETDELIM)/g' \
+             -e 's/@''GNULIB_GETLINE''@/$(GL_GNULIB_GETLINE)/g' \
+             -e 's/@''GNULIB_OBSTACK_PRINTF''@/$(GL_GNULIB_OBSTACK_PRINTF)/g' \
+             -e 
's/@''GNULIB_OBSTACK_PRINTF_POSIX''@/$(GL_GNULIB_OBSTACK_PRINTF_POSIX)/g' \
+             -e 's/@''GNULIB_PCLOSE''@/$(GL_GNULIB_PCLOSE)/g' \
+             -e 's/@''GNULIB_PERROR''@/$(GL_GNULIB_PERROR)/g' \
+             -e 's/@''GNULIB_POPEN''@/$(GL_GNULIB_POPEN)/g' \
+             -e 's/@''GNULIB_PRINTF''@/$(GL_GNULIB_PRINTF)/g' \
+             -e 's/@''GNULIB_PRINTF_POSIX''@/$(GL_GNULIB_PRINTF_POSIX)/g' \
+             -e 's/@''GNULIB_PUTC''@/$(GL_GNULIB_PUTC)/g' \
+             -e 's/@''GNULIB_PUTCHAR''@/$(GL_GNULIB_PUTCHAR)/g' \
+             -e 's/@''GNULIB_PUTS''@/$(GL_GNULIB_PUTS)/g' \
+             -e 's/@''GNULIB_REMOVE''@/$(GL_GNULIB_REMOVE)/g' \
+             -e 's/@''GNULIB_RENAME''@/$(GL_GNULIB_RENAME)/g' \
+             -e 's/@''GNULIB_RENAMEAT''@/$(GL_GNULIB_RENAMEAT)/g' \
+             -e 's/@''GNULIB_SCANF''@/$(GL_GNULIB_SCANF)/g' \
+             -e 's/@''GNULIB_SNPRINTF''@/$(GL_GNULIB_SNPRINTF)/g' \
+             -e 's/@''GNULIB_SPRINTF_POSIX''@/$(GL_GNULIB_SPRINTF_POSIX)/g' \
+             -e 
's/@''GNULIB_STDIO_H_NONBLOCKING''@/$(GL_GNULIB_STDIO_H_NONBLOCKING)/g' \
+             -e 
's/@''GNULIB_STDIO_H_SIGPIPE''@/$(GL_GNULIB_STDIO_H_SIGPIPE)/g' \
+             -e 's/@''GNULIB_TMPFILE''@/$(GL_GNULIB_TMPFILE)/g' \
+             -e 's/@''GNULIB_VASPRINTF''@/$(GL_GNULIB_VASPRINTF)/g' \
+             -e 's/@''GNULIB_VDPRINTF''@/$(GL_GNULIB_VDPRINTF)/g' \
+             -e 's/@''GNULIB_VFPRINTF''@/$(GL_GNULIB_VFPRINTF)/g' \
+             -e 's/@''GNULIB_VFPRINTF_POSIX''@/$(GL_GNULIB_VFPRINTF_POSIX)/g' \
+             -e 's/@''GNULIB_VFSCANF''@/$(GL_GNULIB_VFSCANF)/g' \
+             -e 's/@''GNULIB_VSCANF''@/$(GL_GNULIB_VSCANF)/g' \
+             -e 's/@''GNULIB_VPRINTF''@/$(GL_GNULIB_VPRINTF)/g' \
+             -e 's/@''GNULIB_VPRINTF_POSIX''@/$(GL_GNULIB_VPRINTF_POSIX)/g' \
+             -e 's/@''GNULIB_VSNPRINTF''@/$(GL_GNULIB_VSNPRINTF)/g' \
+             -e 's/@''GNULIB_VSPRINTF_POSIX''@/$(GL_GNULIB_VSPRINTF_POSIX)/g' \
+             -e 's/@''GNULIB_MDA_FCLOSEALL''@/$(GL_GNULIB_MDA_FCLOSEALL)/g' \
+             -e 's/@''GNULIB_MDA_FDOPEN''@/$(GL_GNULIB_MDA_FDOPEN)/g' \
+             -e 's/@''GNULIB_MDA_FILENO''@/$(GL_GNULIB_MDA_FILENO)/g' \
+             -e 's/@''GNULIB_MDA_GETW''@/$(GL_GNULIB_MDA_GETW)/g' \
+             -e 's/@''GNULIB_MDA_PUTW''@/$(GL_GNULIB_MDA_PUTW)/g' \
+             -e 's/@''GNULIB_MDA_TEMPNAM''@/$(GL_GNULIB_MDA_TEMPNAM)/g' \
              < $(srcdir)/stdio.in.h | \
          sed -e 's|@''HAVE_DECL_FCLOSEALL''@|$(HAVE_DECL_FCLOSEALL)|g' \
              -e 's|@''HAVE_DECL_FPURGE''@|$(HAVE_DECL_FPURGE)|g' \
@@ -2606,51 +2645,51 @@ stdlib.h: stdlib.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) \
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_STDLIB_H''@|$(NEXT_STDLIB_H)|g' \
-             -e 's/@''GNULIB__EXIT''@/$(GNULIB__EXIT)/g' \
-             -e 's/@''GNULIB_ALIGNED_ALLOC''@/$(GNULIB_ALIGNED_ALLOC)/g' \
-             -e 's/@''GNULIB_ATOLL''@/$(GNULIB_ATOLL)/g' \
-             -e 's/@''GNULIB_CALLOC_POSIX''@/$(GNULIB_CALLOC_POSIX)/g' \
-             -e 
's/@''GNULIB_CANONICALIZE_FILE_NAME''@/$(GNULIB_CANONICALIZE_FILE_NAME)/g' \
-             -e 's/@''GNULIB_FREE_POSIX''@/$(GNULIB_FREE_POSIX)/g' \
-             -e 's/@''GNULIB_GETLOADAVG''@/$(GNULIB_GETLOADAVG)/g' \
-             -e 's/@''GNULIB_GETSUBOPT''@/$(GNULIB_GETSUBOPT)/g' \
-             -e 's/@''GNULIB_GRANTPT''@/$(GNULIB_GRANTPT)/g' \
-             -e 's/@''GNULIB_MALLOC_POSIX''@/$(GNULIB_MALLOC_POSIX)/g' \
-             -e 's/@''GNULIB_MBTOWC''@/$(GNULIB_MBTOWC)/g' \
-             -e 's/@''GNULIB_MKDTEMP''@/$(GNULIB_MKDTEMP)/g' \
-             -e 's/@''GNULIB_MKOSTEMP''@/$(GNULIB_MKOSTEMP)/g' \
-             -e 's/@''GNULIB_MKOSTEMPS''@/$(GNULIB_MKOSTEMPS)/g' \
-             -e 's/@''GNULIB_MKSTEMP''@/$(GNULIB_MKSTEMP)/g' \
-             -e 's/@''GNULIB_MKSTEMPS''@/$(GNULIB_MKSTEMPS)/g' \
-             -e 's/@''GNULIB_POSIX_MEMALIGN''@/$(GNULIB_POSIX_MEMALIGN)/g' \
-             -e 's/@''GNULIB_POSIX_OPENPT''@/$(GNULIB_POSIX_OPENPT)/g' \
-             -e 's/@''GNULIB_PTSNAME''@/$(GNULIB_PTSNAME)/g' \
-             -e 's/@''GNULIB_PTSNAME_R''@/$(GNULIB_PTSNAME_R)/g' \
-             -e 's/@''GNULIB_PUTENV''@/$(GNULIB_PUTENV)/g' \
-             -e 's/@''GNULIB_QSORT_R''@/$(GNULIB_QSORT_R)/g' \
-             -e 's/@''GNULIB_RANDOM''@/$(GNULIB_RANDOM)/g' \
-             -e 's/@''GNULIB_RANDOM_R''@/$(GNULIB_RANDOM_R)/g' \
-             -e 's/@''GNULIB_REALLOC_POSIX''@/$(GNULIB_REALLOC_POSIX)/g' \
-             -e 's/@''GNULIB_REALLOCARRAY''@/$(GNULIB_REALLOCARRAY)/g' \
-             -e 's/@''GNULIB_REALPATH''@/$(GNULIB_REALPATH)/g' \
-             -e 's/@''GNULIB_RPMATCH''@/$(GNULIB_RPMATCH)/g' \
-             -e 's/@''GNULIB_SECURE_GETENV''@/$(GNULIB_SECURE_GETENV)/g' \
-             -e 's/@''GNULIB_SETENV''@/$(GNULIB_SETENV)/g' \
-             -e 's/@''GNULIB_STRTOD''@/$(GNULIB_STRTOD)/g' \
-             -e 's/@''GNULIB_STRTOL''@/$(GNULIB_STRTOL)/g' \
-             -e 's/@''GNULIB_STRTOLD''@/$(GNULIB_STRTOLD)/g' \
-             -e 's/@''GNULIB_STRTOLL''@/$(GNULIB_STRTOLL)/g' \
-             -e 's/@''GNULIB_STRTOUL''@/$(GNULIB_STRTOUL)/g' \
-             -e 's/@''GNULIB_STRTOULL''@/$(GNULIB_STRTOULL)/g' \
-             -e 's/@''GNULIB_SYSTEM_POSIX''@/$(GNULIB_SYSTEM_POSIX)/g' \
-             -e 's/@''GNULIB_UNLOCKPT''@/$(GNULIB_UNLOCKPT)/g' \
-             -e 's/@''GNULIB_UNSETENV''@/$(GNULIB_UNSETENV)/g' \
-             -e 's/@''GNULIB_WCTOMB''@/$(GNULIB_WCTOMB)/g' \
-             -e 's/@''GNULIB_MDA_ECVT''@/$(GNULIB_MDA_ECVT)/g' \
-             -e 's/@''GNULIB_MDA_FCVT''@/$(GNULIB_MDA_FCVT)/g' \
-             -e 's/@''GNULIB_MDA_GCVT''@/$(GNULIB_MDA_GCVT)/g' \
-             -e 's/@''GNULIB_MDA_MKTEMP''@/$(GNULIB_MDA_MKTEMP)/g' \
-             -e 's/@''GNULIB_MDA_PUTENV''@/$(GNULIB_MDA_PUTENV)/g' \
+             -e 's/@''GNULIB__EXIT''@/$(GL_GNULIB__EXIT)/g' \
+             -e 's/@''GNULIB_ALIGNED_ALLOC''@/$(GL_GNULIB_ALIGNED_ALLOC)/g' \
+             -e 's/@''GNULIB_ATOLL''@/$(GL_GNULIB_ATOLL)/g' \
+             -e 's/@''GNULIB_CALLOC_POSIX''@/$(GL_GNULIB_CALLOC_POSIX)/g' \
+             -e 
's/@''GNULIB_CANONICALIZE_FILE_NAME''@/$(GL_GNULIB_CANONICALIZE_FILE_NAME)/g' \
+             -e 's/@''GNULIB_FREE_POSIX''@/$(GL_GNULIB_FREE_POSIX)/g' \
+             -e 's/@''GNULIB_GETLOADAVG''@/$(GL_GNULIB_GETLOADAVG)/g' \
+             -e 's/@''GNULIB_GETSUBOPT''@/$(GL_GNULIB_GETSUBOPT)/g' \
+             -e 's/@''GNULIB_GRANTPT''@/$(GL_GNULIB_GRANTPT)/g' \
+             -e 's/@''GNULIB_MALLOC_POSIX''@/$(GL_GNULIB_MALLOC_POSIX)/g' \
+             -e 's/@''GNULIB_MBTOWC''@/$(GL_GNULIB_MBTOWC)/g' \
+             -e 's/@''GNULIB_MKDTEMP''@/$(GL_GNULIB_MKDTEMP)/g' \
+             -e 's/@''GNULIB_MKOSTEMP''@/$(GL_GNULIB_MKOSTEMP)/g' \
+             -e 's/@''GNULIB_MKOSTEMPS''@/$(GL_GNULIB_MKOSTEMPS)/g' \
+             -e 's/@''GNULIB_MKSTEMP''@/$(GL_GNULIB_MKSTEMP)/g' \
+             -e 's/@''GNULIB_MKSTEMPS''@/$(GL_GNULIB_MKSTEMPS)/g' \
+             -e 's/@''GNULIB_POSIX_MEMALIGN''@/$(GL_GNULIB_POSIX_MEMALIGN)/g' \
+             -e 's/@''GNULIB_POSIX_OPENPT''@/$(GL_GNULIB_POSIX_OPENPT)/g' \
+             -e 's/@''GNULIB_PTSNAME''@/$(GL_GNULIB_PTSNAME)/g' \
+             -e 's/@''GNULIB_PTSNAME_R''@/$(GL_GNULIB_PTSNAME_R)/g' \
+             -e 's/@''GNULIB_PUTENV''@/$(GL_GNULIB_PUTENV)/g' \
+             -e 's/@''GNULIB_QSORT_R''@/$(GL_GNULIB_QSORT_R)/g' \
+             -e 's/@''GNULIB_RANDOM''@/$(GL_GNULIB_RANDOM)/g' \
+             -e 's/@''GNULIB_RANDOM_R''@/$(GL_GNULIB_RANDOM_R)/g' \
+             -e 's/@''GNULIB_REALLOC_POSIX''@/$(GL_GNULIB_REALLOC_POSIX)/g' \
+             -e 's/@''GNULIB_REALLOCARRAY''@/$(GL_GNULIB_REALLOCARRAY)/g' \
+             -e 's/@''GNULIB_REALPATH''@/$(GL_GNULIB_REALPATH)/g' \
+             -e 's/@''GNULIB_RPMATCH''@/$(GL_GNULIB_RPMATCH)/g' \
+             -e 's/@''GNULIB_SECURE_GETENV''@/$(GL_GNULIB_SECURE_GETENV)/g' \
+             -e 's/@''GNULIB_SETENV''@/$(GL_GNULIB_SETENV)/g' \
+             -e 's/@''GNULIB_STRTOD''@/$(GL_GNULIB_STRTOD)/g' \
+             -e 's/@''GNULIB_STRTOL''@/$(GL_GNULIB_STRTOL)/g' \
+             -e 's/@''GNULIB_STRTOLD''@/$(GL_GNULIB_STRTOLD)/g' \
+             -e 's/@''GNULIB_STRTOLL''@/$(GL_GNULIB_STRTOLL)/g' \
+             -e 's/@''GNULIB_STRTOUL''@/$(GL_GNULIB_STRTOUL)/g' \
+             -e 's/@''GNULIB_STRTOULL''@/$(GL_GNULIB_STRTOULL)/g' \
+             -e 's/@''GNULIB_SYSTEM_POSIX''@/$(GL_GNULIB_SYSTEM_POSIX)/g' \
+             -e 's/@''GNULIB_UNLOCKPT''@/$(GL_GNULIB_UNLOCKPT)/g' \
+             -e 's/@''GNULIB_UNSETENV''@/$(GL_GNULIB_UNSETENV)/g' \
+             -e 's/@''GNULIB_WCTOMB''@/$(GL_GNULIB_WCTOMB)/g' \
+             -e 's/@''GNULIB_MDA_ECVT''@/$(GL_GNULIB_MDA_ECVT)/g' \
+             -e 's/@''GNULIB_MDA_FCVT''@/$(GL_GNULIB_MDA_FCVT)/g' \
+             -e 's/@''GNULIB_MDA_GCVT''@/$(GL_GNULIB_MDA_GCVT)/g' \
+             -e 's/@''GNULIB_MDA_MKTEMP''@/$(GL_GNULIB_MDA_MKTEMP)/g' \
+             -e 's/@''GNULIB_MDA_PUTENV''@/$(GL_GNULIB_MDA_PUTENV)/g' \
              < $(srcdir)/stdlib.in.h | \
          sed -e 's|@''HAVE__EXIT''@|$(HAVE__EXIT)|g' \
              -e 's|@''HAVE_ALIGNED_ALLOC''@|$(HAVE_ALIGNED_ALLOC)|g' \
@@ -2711,6 +2750,7 @@ stdlib.h: stdlib.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) \
              -e 's|@''REPLACE_RANDOM''@|$(REPLACE_RANDOM)|g' \
              -e 's|@''REPLACE_RANDOM_R''@|$(REPLACE_RANDOM_R)|g' \
              -e 's|@''REPLACE_REALLOC''@|$(REPLACE_REALLOC)|g' \
+             -e 's|@''REPLACE_REALLOCARRAY''@|$(REPLACE_REALLOCARRAY)|g' \
              -e 's|@''REPLACE_REALPATH''@|$(REPLACE_REALPATH)|g' \
              -e 's|@''REPLACE_SETENV''@|$(REPLACE_SETENV)|g' \
              -e 's|@''REPLACE_SETSTATE''@|$(REPLACE_SETSTATE)|g' \
@@ -2779,49 +2819,49 @@ string.h: string.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_STRING_H''@|$(NEXT_STRING_H)|g' \
-             -e 's/@''GNULIB_EXPLICIT_BZERO''@/$(GNULIB_EXPLICIT_BZERO)/g' \
-             -e 's/@''GNULIB_FFSL''@/$(GNULIB_FFSL)/g' \
-             -e 's/@''GNULIB_FFSLL''@/$(GNULIB_FFSLL)/g' \
-             -e 's/@''GNULIB_MBSLEN''@/$(GNULIB_MBSLEN)/g' \
-             -e 's/@''GNULIB_MBSNLEN''@/$(GNULIB_MBSNLEN)/g' \
-             -e 's/@''GNULIB_MBSCHR''@/$(GNULIB_MBSCHR)/g' \
-             -e 's/@''GNULIB_MBSRCHR''@/$(GNULIB_MBSRCHR)/g' \
-             -e 's/@''GNULIB_MBSSTR''@/$(GNULIB_MBSSTR)/g' \
-             -e 's/@''GNULIB_MBSCASECMP''@/$(GNULIB_MBSCASECMP)/g' \
-             -e 's/@''GNULIB_MBSNCASECMP''@/$(GNULIB_MBSNCASECMP)/g' \
-             -e 's/@''GNULIB_MBSPCASECMP''@/$(GNULIB_MBSPCASECMP)/g' \
-             -e 's/@''GNULIB_MBSCASESTR''@/$(GNULIB_MBSCASESTR)/g' \
-             -e 's/@''GNULIB_MBSCSPN''@/$(GNULIB_MBSCSPN)/g' \
-             -e 's/@''GNULIB_MBSPBRK''@/$(GNULIB_MBSPBRK)/g' \
-             -e 's/@''GNULIB_MBSSPN''@/$(GNULIB_MBSSPN)/g' \
-             -e 's/@''GNULIB_MBSSEP''@/$(GNULIB_MBSSEP)/g' \
-             -e 's/@''GNULIB_MBSTOK_R''@/$(GNULIB_MBSTOK_R)/g' \
-             -e 's/@''GNULIB_MEMCHR''@/$(GNULIB_MEMCHR)/g' \
-             -e 's/@''GNULIB_MEMMEM''@/$(GNULIB_MEMMEM)/g' \
-             -e 's/@''GNULIB_MEMPCPY''@/$(GNULIB_MEMPCPY)/g' \
-             -e 's/@''GNULIB_MEMRCHR''@/$(GNULIB_MEMRCHR)/g' \
-             -e 's/@''GNULIB_RAWMEMCHR''@/$(GNULIB_RAWMEMCHR)/g' \
-             -e 's/@''GNULIB_STPCPY''@/$(GNULIB_STPCPY)/g' \
-             -e 's/@''GNULIB_STPNCPY''@/$(GNULIB_STPNCPY)/g' \
-             -e 's/@''GNULIB_STRCHRNUL''@/$(GNULIB_STRCHRNUL)/g' \
-             -e 's/@''GNULIB_STRDUP''@/$(GNULIB_STRDUP)/g' \
-             -e 's/@''GNULIB_STRNCAT''@/$(GNULIB_STRNCAT)/g' \
-             -e 's/@''GNULIB_STRNDUP''@/$(GNULIB_STRNDUP)/g' \
-             -e 's/@''GNULIB_STRNLEN''@/$(GNULIB_STRNLEN)/g' \
-             -e 's/@''GNULIB_STRPBRK''@/$(GNULIB_STRPBRK)/g' \
-             -e 's/@''GNULIB_STRSEP''@/$(GNULIB_STRSEP)/g' \
-             -e 's/@''GNULIB_STRSTR''@/$(GNULIB_STRSTR)/g' \
-             -e 's/@''GNULIB_STRCASESTR''@/$(GNULIB_STRCASESTR)/g' \
-             -e 's/@''GNULIB_STRTOK_R''@/$(GNULIB_STRTOK_R)/g' \
-             -e 's/@''GNULIB_STRERROR''@/$(GNULIB_STRERROR)/g' \
-             -e 's/@''GNULIB_STRERROR_R''@/$(GNULIB_STRERROR_R)/g' \
-             -e 's/@''GNULIB_STRERRORNAME_NP''@/$(GNULIB_STRERRORNAME_NP)/g' \
-             -e 's/@''GNULIB_SIGABBREV_NP''@/$(GNULIB_SIGABBREV_NP)/g' \
-             -e 's/@''GNULIB_SIGDESCR_NP''@/$(GNULIB_SIGDESCR_NP)/g' \
-             -e 's/@''GNULIB_STRSIGNAL''@/$(GNULIB_STRSIGNAL)/g' \
-             -e 's/@''GNULIB_STRVERSCMP''@/$(GNULIB_STRVERSCMP)/g' \
-             -e 's/@''GNULIB_MDA_MEMCCPY''@/$(GNULIB_MDA_MEMCCPY)/g' \
-             -e 's/@''GNULIB_MDA_STRDUP''@/$(GNULIB_MDA_STRDUP)/g' \
+             -e 's/@''GNULIB_EXPLICIT_BZERO''@/$(GL_GNULIB_EXPLICIT_BZERO)/g' \
+             -e 's/@''GNULIB_FFSL''@/$(GL_GNULIB_FFSL)/g' \
+             -e 's/@''GNULIB_FFSLL''@/$(GL_GNULIB_FFSLL)/g' \
+             -e 's/@''GNULIB_MBSLEN''@/$(GL_GNULIB_MBSLEN)/g' \
+             -e 's/@''GNULIB_MBSNLEN''@/$(GL_GNULIB_MBSNLEN)/g' \
+             -e 's/@''GNULIB_MBSCHR''@/$(GL_GNULIB_MBSCHR)/g' \
+             -e 's/@''GNULIB_MBSRCHR''@/$(GL_GNULIB_MBSRCHR)/g' \
+             -e 's/@''GNULIB_MBSSTR''@/$(GL_GNULIB_MBSSTR)/g' \
+             -e 's/@''GNULIB_MBSCASECMP''@/$(GL_GNULIB_MBSCASECMP)/g' \
+             -e 's/@''GNULIB_MBSNCASECMP''@/$(GL_GNULIB_MBSNCASECMP)/g' \
+             -e 's/@''GNULIB_MBSPCASECMP''@/$(GL_GNULIB_MBSPCASECMP)/g' \
+             -e 's/@''GNULIB_MBSCASESTR''@/$(GL_GNULIB_MBSCASESTR)/g' \
+             -e 's/@''GNULIB_MBSCSPN''@/$(GL_GNULIB_MBSCSPN)/g' \
+             -e 's/@''GNULIB_MBSPBRK''@/$(GL_GNULIB_MBSPBRK)/g' \
+             -e 's/@''GNULIB_MBSSPN''@/$(GL_GNULIB_MBSSPN)/g' \
+             -e 's/@''GNULIB_MBSSEP''@/$(GL_GNULIB_MBSSEP)/g' \
+             -e 's/@''GNULIB_MBSTOK_R''@/$(GL_GNULIB_MBSTOK_R)/g' \
+             -e 's/@''GNULIB_MEMCHR''@/$(GL_GNULIB_MEMCHR)/g' \
+             -e 's/@''GNULIB_MEMMEM''@/$(GL_GNULIB_MEMMEM)/g' \
+             -e 's/@''GNULIB_MEMPCPY''@/$(GL_GNULIB_MEMPCPY)/g' \
+             -e 's/@''GNULIB_MEMRCHR''@/$(GL_GNULIB_MEMRCHR)/g' \
+             -e 's/@''GNULIB_RAWMEMCHR''@/$(GL_GNULIB_RAWMEMCHR)/g' \
+             -e 's/@''GNULIB_STPCPY''@/$(GL_GNULIB_STPCPY)/g' \
+             -e 's/@''GNULIB_STPNCPY''@/$(GL_GNULIB_STPNCPY)/g' \
+             -e 's/@''GNULIB_STRCHRNUL''@/$(GL_GNULIB_STRCHRNUL)/g' \
+             -e 's/@''GNULIB_STRDUP''@/$(GL_GNULIB_STRDUP)/g' \
+             -e 's/@''GNULIB_STRNCAT''@/$(GL_GNULIB_STRNCAT)/g' \
+             -e 's/@''GNULIB_STRNDUP''@/$(GL_GNULIB_STRNDUP)/g' \
+             -e 's/@''GNULIB_STRNLEN''@/$(GL_GNULIB_STRNLEN)/g' \
+             -e 's/@''GNULIB_STRPBRK''@/$(GL_GNULIB_STRPBRK)/g' \
+             -e 's/@''GNULIB_STRSEP''@/$(GL_GNULIB_STRSEP)/g' \
+             -e 's/@''GNULIB_STRSTR''@/$(GL_GNULIB_STRSTR)/g' \
+             -e 's/@''GNULIB_STRCASESTR''@/$(GL_GNULIB_STRCASESTR)/g' \
+             -e 's/@''GNULIB_STRTOK_R''@/$(GL_GNULIB_STRTOK_R)/g' \
+             -e 's/@''GNULIB_STRERROR''@/$(GL_GNULIB_STRERROR)/g' \
+             -e 's/@''GNULIB_STRERROR_R''@/$(GL_GNULIB_STRERROR_R)/g' \
+             -e 
's/@''GNULIB_STRERRORNAME_NP''@/$(GL_GNULIB_STRERRORNAME_NP)/g' \
+             -e 's/@''GNULIB_SIGABBREV_NP''@/$(GL_GNULIB_SIGABBREV_NP)/g' \
+             -e 's/@''GNULIB_SIGDESCR_NP''@/$(GL_GNULIB_SIGDESCR_NP)/g' \
+             -e 's/@''GNULIB_STRSIGNAL''@/$(GL_GNULIB_STRSIGNAL)/g' \
+             -e 's/@''GNULIB_STRVERSCMP''@/$(GL_GNULIB_STRVERSCMP)/g' \
+             -e 's/@''GNULIB_MDA_MEMCCPY''@/$(GL_GNULIB_MDA_MEMCCPY)/g' \
+             -e 's/@''GNULIB_MDA_STRDUP''@/$(GL_GNULIB_MDA_STRDUP)/g' \
              < $(srcdir)/string.in.h | \
          sed -e 's|@''HAVE_EXPLICIT_BZERO''@|$(HAVE_EXPLICIT_BZERO)|g' \
              -e 's|@''HAVE_FFSL''@|$(HAVE_FFSL)|g' \
@@ -2893,7 +2933,7 @@ sys/file.h: sys_file.in.h $(top_builddir)/config.status 
$(WARN_ON_USE_H)
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_SYS_FILE_H''@|$(NEXT_SYS_FILE_H)|g' \
              -e 's/@''HAVE_FLOCK''@/$(HAVE_FLOCK)/g' \
-             -e 's/@''GNULIB_FLOCK''@/$(GNULIB_FLOCK)/g' \
+             -e 's/@''GNULIB_FLOCK''@/$(GL_GNULIB_FLOCK)/g' \
              -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
              < $(srcdir)/sys_file.in.h; \
        } > $@-t && \
@@ -2922,7 +2962,7 @@ sys/random.h: sys_random.in.h 
$(top_builddir)/config.status $(CXXDEFS_H) $(ARG_N
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_SYS_RANDOM_H''@|$(NEXT_SYS_RANDOM_H)|g' \
              -e 's|@''HAVE_SYS_RANDOM_H''@|$(HAVE_SYS_RANDOM_H)|g' \
-             -e 's/@''GNULIB_GETRANDOM''@/$(GNULIB_GETRANDOM)/g' \
+             -e 's/@''GNULIB_GETRANDOM''@/$(GL_GNULIB_GETRANDOM)/g' \
              -e 's/@''HAVE_GETRANDOM''@/$(HAVE_GETRANDOM)/g' \
              -e 's/@''REPLACE_GETRANDOM''@/$(REPLACE_GETRANDOM)/g' \
              -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
@@ -2955,8 +2995,8 @@ sys/select.h: sys_select.in.h 
$(top_builddir)/config.status $(CXXDEFS_H) $(WARN_
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_SYS_SELECT_H''@|$(NEXT_SYS_SELECT_H)|g' \
              -e 's|@''HAVE_SYS_SELECT_H''@|$(HAVE_SYS_SELECT_H)|g' \
-             -e 's/@''GNULIB_PSELECT''@/$(GNULIB_PSELECT)/g' \
-             -e 's/@''GNULIB_SELECT''@/$(GNULIB_SELECT)/g' \
+             -e 's/@''GNULIB_PSELECT''@/$(GL_GNULIB_PSELECT)/g' \
+             -e 's/@''GNULIB_SELECT''@/$(GL_GNULIB_SELECT)/g' \
              -e 's|@''HAVE_WINSOCK2_H''@|$(HAVE_WINSOCK2_H)|g' \
              -e 's|@''HAVE_PSELECT''@|$(HAVE_PSELECT)|g' \
              -e 's|@''REPLACE_PSELECT''@|$(REPLACE_PSELECT)|g' \
@@ -2990,22 +3030,22 @@ sys/socket.h: sys_socket.in.h 
$(top_builddir)/config.status $(CXXDEFS_H) $(WARN_
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_SYS_SOCKET_H''@|$(NEXT_SYS_SOCKET_H)|g' \
              -e 's|@''HAVE_SYS_SOCKET_H''@|$(HAVE_SYS_SOCKET_H)|g' \
-             -e 's/@''GNULIB_CLOSE''@/$(GNULIB_CLOSE)/g' \
-             -e 's/@''GNULIB_SOCKET''@/$(GNULIB_SOCKET)/g' \
-             -e 's/@''GNULIB_CONNECT''@/$(GNULIB_CONNECT)/g' \
-             -e 's/@''GNULIB_ACCEPT''@/$(GNULIB_ACCEPT)/g' \
-             -e 's/@''GNULIB_BIND''@/$(GNULIB_BIND)/g' \
-             -e 's/@''GNULIB_GETPEERNAME''@/$(GNULIB_GETPEERNAME)/g' \
-             -e 's/@''GNULIB_GETSOCKNAME''@/$(GNULIB_GETSOCKNAME)/g' \
-             -e 's/@''GNULIB_GETSOCKOPT''@/$(GNULIB_GETSOCKOPT)/g' \
-             -e 's/@''GNULIB_LISTEN''@/$(GNULIB_LISTEN)/g' \
-             -e 's/@''GNULIB_RECV''@/$(GNULIB_RECV)/g' \
-             -e 's/@''GNULIB_SEND''@/$(GNULIB_SEND)/g' \
-             -e 's/@''GNULIB_RECVFROM''@/$(GNULIB_RECVFROM)/g' \
-             -e 's/@''GNULIB_SENDTO''@/$(GNULIB_SENDTO)/g' \
-             -e 's/@''GNULIB_SETSOCKOPT''@/$(GNULIB_SETSOCKOPT)/g' \
-             -e 's/@''GNULIB_SHUTDOWN''@/$(GNULIB_SHUTDOWN)/g' \
-             -e 's/@''GNULIB_ACCEPT4''@/$(GNULIB_ACCEPT4)/g' \
+             -e 's/@''GNULIB_CLOSE''@/$(GL_GNULIB_CLOSE)/g' \
+             -e 's/@''GNULIB_SOCKET''@/$(GL_GNULIB_SOCKET)/g' \
+             -e 's/@''GNULIB_CONNECT''@/$(GL_GNULIB_CONNECT)/g' \
+             -e 's/@''GNULIB_ACCEPT''@/$(GL_GNULIB_ACCEPT)/g' \
+             -e 's/@''GNULIB_BIND''@/$(GL_GNULIB_BIND)/g' \
+             -e 's/@''GNULIB_GETPEERNAME''@/$(GL_GNULIB_GETPEERNAME)/g' \
+             -e 's/@''GNULIB_GETSOCKNAME''@/$(GL_GNULIB_GETSOCKNAME)/g' \
+             -e 's/@''GNULIB_GETSOCKOPT''@/$(GL_GNULIB_GETSOCKOPT)/g' \
+             -e 's/@''GNULIB_LISTEN''@/$(GL_GNULIB_LISTEN)/g' \
+             -e 's/@''GNULIB_RECV''@/$(GL_GNULIB_RECV)/g' \
+             -e 's/@''GNULIB_SEND''@/$(GL_GNULIB_SEND)/g' \
+             -e 's/@''GNULIB_RECVFROM''@/$(GL_GNULIB_RECVFROM)/g' \
+             -e 's/@''GNULIB_SENDTO''@/$(GL_GNULIB_SENDTO)/g' \
+             -e 's/@''GNULIB_SETSOCKOPT''@/$(GL_GNULIB_SETSOCKOPT)/g' \
+             -e 's/@''GNULIB_SHUTDOWN''@/$(GL_GNULIB_SHUTDOWN)/g' \
+             -e 's/@''GNULIB_ACCEPT4''@/$(GL_GNULIB_ACCEPT4)/g' \
              -e 's|@''HAVE_WINSOCK2_H''@|$(HAVE_WINSOCK2_H)|g' \
              -e 's|@''HAVE_WS2TCPIP_H''@|$(HAVE_WS2TCPIP_H)|g' \
              -e 
's|@''HAVE_STRUCT_SOCKADDR_STORAGE''@|$(HAVE_STRUCT_SOCKADDR_STORAGE)|g' \
@@ -3042,25 +3082,25 @@ sys/stat.h: sys_stat.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNU
              -e 's|@''NEXT_SYS_STAT_H''@|$(NEXT_SYS_STAT_H)|g' \
              -e 's|@''WINDOWS_64_BIT_ST_SIZE''@|$(WINDOWS_64_BIT_ST_SIZE)|g' \
              -e 's|@''WINDOWS_STAT_TIMESPEC''@|$(WINDOWS_STAT_TIMESPEC)|g' \
-             -e 's/@''GNULIB_FCHMODAT''@/$(GNULIB_FCHMODAT)/g' \
-             -e 's/@''GNULIB_FSTAT''@/$(GNULIB_FSTAT)/g' \
-             -e 's/@''GNULIB_FSTATAT''@/$(GNULIB_FSTATAT)/g' \
-             -e 's/@''GNULIB_FUTIMENS''@/$(GNULIB_FUTIMENS)/g' \
-             -e 's/@''GNULIB_GETUMASK''@/$(GNULIB_GETUMASK)/g' \
-             -e 's/@''GNULIB_LCHMOD''@/$(GNULIB_LCHMOD)/g' \
-             -e 's/@''GNULIB_LSTAT''@/$(GNULIB_LSTAT)/g' \
-             -e 's/@''GNULIB_MKDIR''@/$(GNULIB_MKDIR)/g' \
-             -e 's/@''GNULIB_MKDIRAT''@/$(GNULIB_MKDIRAT)/g' \
-             -e 's/@''GNULIB_MKFIFO''@/$(GNULIB_MKFIFO)/g' \
-             -e 's/@''GNULIB_MKFIFOAT''@/$(GNULIB_MKFIFOAT)/g' \
-             -e 's/@''GNULIB_MKNOD''@/$(GNULIB_MKNOD)/g' \
-             -e 's/@''GNULIB_MKNODAT''@/$(GNULIB_MKNODAT)/g' \
-             -e 's/@''GNULIB_STAT''@/$(GNULIB_STAT)/g' \
-             -e 's/@''GNULIB_UTIMENSAT''@/$(GNULIB_UTIMENSAT)/g' \
-             -e 
's/@''GNULIB_OVERRIDES_STRUCT_STAT''@/$(GNULIB_OVERRIDES_STRUCT_STAT)/g' \
-             -e 's/@''GNULIB_MDA_CHMOD''@/$(GNULIB_MDA_CHMOD)/g' \
-             -e 's/@''GNULIB_MDA_MKDIR''@/$(GNULIB_MDA_MKDIR)/g' \
-             -e 's/@''GNULIB_MDA_UMASK''@/$(GNULIB_MDA_UMASK)/g' \
+             -e 's/@''GNULIB_FCHMODAT''@/$(GL_GNULIB_FCHMODAT)/g' \
+             -e 's/@''GNULIB_FSTAT''@/$(GL_GNULIB_FSTAT)/g' \
+             -e 's/@''GNULIB_FSTATAT''@/$(GL_GNULIB_FSTATAT)/g' \
+             -e 's/@''GNULIB_FUTIMENS''@/$(GL_GNULIB_FUTIMENS)/g' \
+             -e 's/@''GNULIB_GETUMASK''@/$(GL_GNULIB_GETUMASK)/g' \
+             -e 's/@''GNULIB_LCHMOD''@/$(GL_GNULIB_LCHMOD)/g' \
+             -e 's/@''GNULIB_LSTAT''@/$(GL_GNULIB_LSTAT)/g' \
+             -e 's/@''GNULIB_MKDIR''@/$(GL_GNULIB_MKDIR)/g' \
+             -e 's/@''GNULIB_MKDIRAT''@/$(GL_GNULIB_MKDIRAT)/g' \
+             -e 's/@''GNULIB_MKFIFO''@/$(GL_GNULIB_MKFIFO)/g' \
+             -e 's/@''GNULIB_MKFIFOAT''@/$(GL_GNULIB_MKFIFOAT)/g' \
+             -e 's/@''GNULIB_MKNOD''@/$(GL_GNULIB_MKNOD)/g' \
+             -e 's/@''GNULIB_MKNODAT''@/$(GL_GNULIB_MKNODAT)/g' \
+             -e 's/@''GNULIB_STAT''@/$(GL_GNULIB_STAT)/g' \
+             -e 's/@''GNULIB_UTIMENSAT''@/$(GL_GNULIB_UTIMENSAT)/g' \
+             -e 
's/@''GNULIB_OVERRIDES_STRUCT_STAT''@/$(GL_GNULIB_OVERRIDES_STRUCT_STAT)/g' \
+             -e 's/@''GNULIB_MDA_CHMOD''@/$(GL_GNULIB_MDA_CHMOD)/g' \
+             -e 's/@''GNULIB_MDA_MKDIR''@/$(GL_GNULIB_MDA_MKDIR)/g' \
+             -e 's/@''GNULIB_MDA_UMASK''@/$(GL_GNULIB_MDA_UMASK)/g' \
              -e 's|@''HAVE_FCHMODAT''@|$(HAVE_FCHMODAT)|g' \
              -e 's|@''HAVE_FSTATAT''@|$(HAVE_FSTATAT)|g' \
              -e 's|@''HAVE_FUTIMENS''@|$(HAVE_FUTIMENS)|g' \
@@ -3114,7 +3154,7 @@ sys/time.h: sys_time.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNU
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_SYS_TIME_H''@|$(NEXT_SYS_TIME_H)|g' \
-             -e 's/@''GNULIB_GETTIMEOFDAY''@/$(GNULIB_GETTIMEOFDAY)/g' \
+             -e 's/@''GNULIB_GETTIMEOFDAY''@/$(GL_GNULIB_GETTIMEOFDAY)/g' \
              -e 's|@''HAVE_WINSOCK2_H''@|$(HAVE_WINSOCK2_H)|g' \
              -e 's/@''HAVE_GETTIMEOFDAY''@/$(HAVE_GETTIMEOFDAY)/g' \
              -e 's/@''HAVE_STRUCT_TIMEVAL''@/$(HAVE_STRUCT_TIMEVAL)/g' \
@@ -3148,7 +3188,7 @@ sys/times.h: sys_times.in.h $(top_builddir)/config.status 
$(WARN_ON_USE_H) $(ARG
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_SYS_TIMES_H''@|$(NEXT_SYS_TIMES_H)|g' \
-             -e 's/@''GNULIB_TIMES''@/$(GNULIB_TIMES)/g' \
+             -e 's/@''GNULIB_TIMES''@/$(GL_GNULIB_TIMES)/g' \
              -e 's|@''HAVE_STRUCT_TMS''@|$(HAVE_STRUCT_TMS)|g' \
              -e 's|@''HAVE_TIMES''@|$(HAVE_TIMES)|g' \
              -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
@@ -3239,18 +3279,18 @@ time.h: time.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H) $(
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_TIME_H''@|$(NEXT_TIME_H)|g' \
-             -e 's/@''GNULIB_CTIME''@/$(GNULIB_CTIME)/g' \
-             -e 's/@''GNULIB_LOCALTIME''@/$(GNULIB_LOCALTIME)/g' \
-             -e 's/@''GNULIB_MKTIME''@/$(GNULIB_MKTIME)/g' \
-             -e 's/@''GNULIB_NANOSLEEP''@/$(GNULIB_NANOSLEEP)/g' \
-             -e 's/@''GNULIB_STRFTIME''@/$(GNULIB_STRFTIME)/g' \
-             -e 's/@''GNULIB_STRPTIME''@/$(GNULIB_STRPTIME)/g' \
-             -e 's/@''GNULIB_TIMEGM''@/$(GNULIB_TIMEGM)/g' \
-             -e 's/@''GNULIB_TIMESPEC_GET''@/$(GNULIB_TIMESPEC_GET)/g' \
-             -e 's/@''GNULIB_TIME_R''@/$(GNULIB_TIME_R)/g' \
-             -e 's/@''GNULIB_TIME_RZ''@/$(GNULIB_TIME_RZ)/g' \
-             -e 's/@''GNULIB_TZSET''@/$(GNULIB_TZSET)/g' \
-             -e 's/@''GNULIB_MDA_TZSET''@/$(GNULIB_MDA_TZSET)/g' \
+             -e 's/@''GNULIB_CTIME''@/$(GL_GNULIB_CTIME)/g' \
+             -e 's/@''GNULIB_LOCALTIME''@/$(GL_GNULIB_LOCALTIME)/g' \
+             -e 's/@''GNULIB_MKTIME''@/$(GL_GNULIB_MKTIME)/g' \
+             -e 's/@''GNULIB_NANOSLEEP''@/$(GL_GNULIB_NANOSLEEP)/g' \
+             -e 's/@''GNULIB_STRFTIME''@/$(GL_GNULIB_STRFTIME)/g' \
+             -e 's/@''GNULIB_STRPTIME''@/$(GL_GNULIB_STRPTIME)/g' \
+             -e 's/@''GNULIB_TIMEGM''@/$(GL_GNULIB_TIMEGM)/g' \
+             -e 's/@''GNULIB_TIMESPEC_GET''@/$(GL_GNULIB_TIMESPEC_GET)/g' \
+             -e 's/@''GNULIB_TIME_R''@/$(GL_GNULIB_TIME_R)/g' \
+             -e 's/@''GNULIB_TIME_RZ''@/$(GL_GNULIB_TIME_RZ)/g' \
+             -e 's/@''GNULIB_TZSET''@/$(GL_GNULIB_TZSET)/g' \
+             -e 's/@''GNULIB_MDA_TZSET''@/$(GL_GNULIB_MDA_TZSET)/g' \
              -e 's|@''HAVE_DECL_LOCALTIME_R''@|$(HAVE_DECL_LOCALTIME_R)|g' \
              -e 's|@''HAVE_NANOSLEEP''@|$(HAVE_NANOSLEEP)|g' \
              -e 's|@''HAVE_STRPTIME''@|$(HAVE_STRPTIME)|g' \
@@ -3360,89 +3400,89 @@ unistd.h: unistd.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_UNISTD_H''@|$(NEXT_UNISTD_H)|g' \
              -e 's|@''WINDOWS_64_BIT_OFF_T''@|$(WINDOWS_64_BIT_OFF_T)|g' \
-             -e 's/@''GNULIB_ACCESS''@/$(GNULIB_ACCESS)/g' \
-             -e 's/@''GNULIB_CHDIR''@/$(GNULIB_CHDIR)/g' \
-             -e 's/@''GNULIB_CHOWN''@/$(GNULIB_CHOWN)/g' \
-             -e 's/@''GNULIB_CLOSE''@/$(GNULIB_CLOSE)/g' \
-             -e 's/@''GNULIB_COPY_FILE_RANGE''@/$(GNULIB_COPY_FILE_RANGE)/g' \
-             -e 's/@''GNULIB_DUP''@/$(GNULIB_DUP)/g' \
-             -e 's/@''GNULIB_DUP2''@/$(GNULIB_DUP2)/g' \
-             -e 's/@''GNULIB_DUP3''@/$(GNULIB_DUP3)/g' \
-             -e 's/@''GNULIB_ENVIRON''@/$(GNULIB_ENVIRON)/g' \
-             -e 's/@''GNULIB_EUIDACCESS''@/$(GNULIB_EUIDACCESS)/g' \
-             -e 's/@''GNULIB_EXECL''@/$(GNULIB_EXECL)/g' \
-             -e 's/@''GNULIB_EXECLE''@/$(GNULIB_EXECLE)/g' \
-             -e 's/@''GNULIB_EXECLP''@/$(GNULIB_EXECLP)/g' \
-             -e 's/@''GNULIB_EXECV''@/$(GNULIB_EXECV)/g' \
-             -e 's/@''GNULIB_EXECVE''@/$(GNULIB_EXECVE)/g' \
-             -e 's/@''GNULIB_EXECVP''@/$(GNULIB_EXECVP)/g' \
-             -e 's/@''GNULIB_EXECVPE''@/$(GNULIB_EXECVPE)/g' \
-             -e 's/@''GNULIB_FACCESSAT''@/$(GNULIB_FACCESSAT)/g' \
-             -e 's/@''GNULIB_FCHDIR''@/$(GNULIB_FCHDIR)/g' \
-             -e 's/@''GNULIB_FCHOWNAT''@/$(GNULIB_FCHOWNAT)/g' \
-             -e 's/@''GNULIB_FDATASYNC''@/$(GNULIB_FDATASYNC)/g' \
-             -e 's/@''GNULIB_FSYNC''@/$(GNULIB_FSYNC)/g' \
-             -e 's/@''GNULIB_FTRUNCATE''@/$(GNULIB_FTRUNCATE)/g' \
-             -e 's/@''GNULIB_GETCWD''@/$(GNULIB_GETCWD)/g' \
-             -e 's/@''GNULIB_GETDOMAINNAME''@/$(GNULIB_GETDOMAINNAME)/g' \
-             -e 's/@''GNULIB_GETDTABLESIZE''@/$(GNULIB_GETDTABLESIZE)/g' \
-             -e 's/@''GNULIB_GETENTROPY''@/$(GNULIB_GETENTROPY)/g' \
-             -e 's/@''GNULIB_GETGROUPS''@/$(GNULIB_GETGROUPS)/g' \
-             -e 's/@''GNULIB_GETHOSTNAME''@/$(GNULIB_GETHOSTNAME)/g' \
-             -e 's/@''GNULIB_GETLOGIN''@/$(GNULIB_GETLOGIN)/g' \
-             -e 's/@''GNULIB_GETLOGIN_R''@/$(GNULIB_GETLOGIN_R)/g' \
-             -e 's/@''GNULIB_GETOPT_POSIX''@/$(GNULIB_GETOPT_POSIX)/g' \
-             -e 's/@''GNULIB_GETPAGESIZE''@/$(GNULIB_GETPAGESIZE)/g' \
-             -e 's/@''GNULIB_GETPASS''@/$(GNULIB_GETPASS)/g' \
-             -e 's/@''GNULIB_GETUSERSHELL''@/$(GNULIB_GETUSERSHELL)/g' \
-             -e 's/@''GNULIB_GROUP_MEMBER''@/$(GNULIB_GROUP_MEMBER)/g' \
-             -e 's/@''GNULIB_ISATTY''@/$(GNULIB_ISATTY)/g' \
-             -e 's/@''GNULIB_LCHOWN''@/$(GNULIB_LCHOWN)/g' \
-             -e 's/@''GNULIB_LINK''@/$(GNULIB_LINK)/g' \
-             -e 's/@''GNULIB_LINKAT''@/$(GNULIB_LINKAT)/g' \
-             -e 's/@''GNULIB_LSEEK''@/$(GNULIB_LSEEK)/g' \
-             -e 's/@''GNULIB_PIPE''@/$(GNULIB_PIPE)/g' \
-             -e 's/@''GNULIB_PIPE2''@/$(GNULIB_PIPE2)/g' \
-             -e 's/@''GNULIB_PREAD''@/$(GNULIB_PREAD)/g' \
-             -e 's/@''GNULIB_PWRITE''@/$(GNULIB_PWRITE)/g' \
-             -e 's/@''GNULIB_READ''@/$(GNULIB_READ)/g' \
-             -e 's/@''GNULIB_READLINK''@/$(GNULIB_READLINK)/g' \
-             -e 's/@''GNULIB_READLINKAT''@/$(GNULIB_READLINKAT)/g' \
-             -e 's/@''GNULIB_RMDIR''@/$(GNULIB_RMDIR)/g' \
-             -e 's/@''GNULIB_SETHOSTNAME''@/$(GNULIB_SETHOSTNAME)/g' \
-             -e 's/@''GNULIB_SLEEP''@/$(GNULIB_SLEEP)/g' \
-             -e 's/@''GNULIB_SYMLINK''@/$(GNULIB_SYMLINK)/g' \
-             -e 's/@''GNULIB_SYMLINKAT''@/$(GNULIB_SYMLINKAT)/g' \
-             -e 's/@''GNULIB_TRUNCATE''@/$(GNULIB_TRUNCATE)/g' \
-             -e 's/@''GNULIB_TTYNAME_R''@/$(GNULIB_TTYNAME_R)/g' \
-             -e 
's/@''GNULIB_UNISTD_H_GETOPT''@/0$(GNULIB_GL_UNISTD_H_GETOPT)/g' \
-             -e 
's/@''GNULIB_UNISTD_H_NONBLOCKING''@/$(GNULIB_UNISTD_H_NONBLOCKING)/g' \
-             -e 's/@''GNULIB_UNISTD_H_SIGPIPE''@/$(GNULIB_UNISTD_H_SIGPIPE)/g' 
\
-             -e 's/@''GNULIB_UNLINK''@/$(GNULIB_UNLINK)/g' \
-             -e 's/@''GNULIB_UNLINKAT''@/$(GNULIB_UNLINKAT)/g' \
-             -e 's/@''GNULIB_USLEEP''@/$(GNULIB_USLEEP)/g' \
-             -e 's/@''GNULIB_WRITE''@/$(GNULIB_WRITE)/g' \
-             -e 's/@''GNULIB_MDA_ACCESS''@/$(GNULIB_MDA_ACCESS)/g' \
-             -e 's/@''GNULIB_MDA_CHDIR''@/$(GNULIB_MDA_CHDIR)/g' \
-             -e 's/@''GNULIB_MDA_CLOSE''@/$(GNULIB_MDA_CLOSE)/g' \
-             -e 's/@''GNULIB_MDA_DUP''@/$(GNULIB_MDA_DUP)/g' \
-             -e 's/@''GNULIB_MDA_DUP2''@/$(GNULIB_MDA_DUP2)/g' \
-             -e 's/@''GNULIB_MDA_EXECL''@/$(GNULIB_MDA_EXECL)/g' \
-             -e 's/@''GNULIB_MDA_EXECLE''@/$(GNULIB_MDA_EXECLE)/g' \
-             -e 's/@''GNULIB_MDA_EXECLP''@/$(GNULIB_MDA_EXECLP)/g' \
-             -e 's/@''GNULIB_MDA_EXECV''@/$(GNULIB_MDA_EXECV)/g' \
-             -e 's/@''GNULIB_MDA_EXECVE''@/$(GNULIB_MDA_EXECVE)/g' \
-             -e 's/@''GNULIB_MDA_EXECVP''@/$(GNULIB_MDA_EXECVP)/g' \
-             -e 's/@''GNULIB_MDA_EXECVPE''@/$(GNULIB_MDA_EXECVPE)/g' \
-             -e 's/@''GNULIB_MDA_GETCWD''@/$(GNULIB_MDA_GETCWD)/g' \
-             -e 's/@''GNULIB_MDA_GETPID''@/$(GNULIB_MDA_GETPID)/g' \
-             -e 's/@''GNULIB_MDA_ISATTY''@/$(GNULIB_MDA_ISATTY)/g' \
-             -e 's/@''GNULIB_MDA_LSEEK''@/$(GNULIB_MDA_LSEEK)/g' \
-             -e 's/@''GNULIB_MDA_READ''@/$(GNULIB_MDA_READ)/g' \
-             -e 's/@''GNULIB_MDA_RMDIR''@/$(GNULIB_MDA_RMDIR)/g' \
-             -e 's/@''GNULIB_MDA_SWAB''@/$(GNULIB_MDA_SWAB)/g' \
-             -e 's/@''GNULIB_MDA_UNLINK''@/$(GNULIB_MDA_UNLINK)/g' \
-             -e 's/@''GNULIB_MDA_WRITE''@/$(GNULIB_MDA_WRITE)/g' \
+             -e 's/@''GNULIB_ACCESS''@/$(GL_GNULIB_ACCESS)/g' \
+             -e 's/@''GNULIB_CHDIR''@/$(GL_GNULIB_CHDIR)/g' \
+             -e 's/@''GNULIB_CHOWN''@/$(GL_GNULIB_CHOWN)/g' \
+             -e 's/@''GNULIB_CLOSE''@/$(GL_GNULIB_CLOSE)/g' \
+             -e 
's/@''GNULIB_COPY_FILE_RANGE''@/$(GL_GNULIB_COPY_FILE_RANGE)/g' \
+             -e 's/@''GNULIB_DUP''@/$(GL_GNULIB_DUP)/g' \
+             -e 's/@''GNULIB_DUP2''@/$(GL_GNULIB_DUP2)/g' \
+             -e 's/@''GNULIB_DUP3''@/$(GL_GNULIB_DUP3)/g' \
+             -e 's/@''GNULIB_ENVIRON''@/$(GL_GNULIB_ENVIRON)/g' \
+             -e 's/@''GNULIB_EUIDACCESS''@/$(GL_GNULIB_EUIDACCESS)/g' \
+             -e 's/@''GNULIB_EXECL''@/$(GL_GNULIB_EXECL)/g' \
+             -e 's/@''GNULIB_EXECLE''@/$(GL_GNULIB_EXECLE)/g' \
+             -e 's/@''GNULIB_EXECLP''@/$(GL_GNULIB_EXECLP)/g' \
+             -e 's/@''GNULIB_EXECV''@/$(GL_GNULIB_EXECV)/g' \
+             -e 's/@''GNULIB_EXECVE''@/$(GL_GNULIB_EXECVE)/g' \
+             -e 's/@''GNULIB_EXECVP''@/$(GL_GNULIB_EXECVP)/g' \
+             -e 's/@''GNULIB_EXECVPE''@/$(GL_GNULIB_EXECVPE)/g' \
+             -e 's/@''GNULIB_FACCESSAT''@/$(GL_GNULIB_FACCESSAT)/g' \
+             -e 's/@''GNULIB_FCHDIR''@/$(GL_GNULIB_FCHDIR)/g' \
+             -e 's/@''GNULIB_FCHOWNAT''@/$(GL_GNULIB_FCHOWNAT)/g' \
+             -e 's/@''GNULIB_FDATASYNC''@/$(GL_GNULIB_FDATASYNC)/g' \
+             -e 's/@''GNULIB_FSYNC''@/$(GL_GNULIB_FSYNC)/g' \
+             -e 's/@''GNULIB_FTRUNCATE''@/$(GL_GNULIB_FTRUNCATE)/g' \
+             -e 's/@''GNULIB_GETCWD''@/$(GL_GNULIB_GETCWD)/g' \
+             -e 's/@''GNULIB_GETDOMAINNAME''@/$(GL_GNULIB_GETDOMAINNAME)/g' \
+             -e 's/@''GNULIB_GETDTABLESIZE''@/$(GL_GNULIB_GETDTABLESIZE)/g' \
+             -e 's/@''GNULIB_GETENTROPY''@/$(GL_GNULIB_GETENTROPY)/g' \
+             -e 's/@''GNULIB_GETGROUPS''@/$(GL_GNULIB_GETGROUPS)/g' \
+             -e 's/@''GNULIB_GETHOSTNAME''@/$(GL_GNULIB_GETHOSTNAME)/g' \
+             -e 's/@''GNULIB_GETLOGIN''@/$(GL_GNULIB_GETLOGIN)/g' \
+             -e 's/@''GNULIB_GETLOGIN_R''@/$(GL_GNULIB_GETLOGIN_R)/g' \
+             -e 's/@''GNULIB_GETOPT_POSIX''@/$(GL_GNULIB_GETOPT_POSIX)/g' \
+             -e 's/@''GNULIB_GETPAGESIZE''@/$(GL_GNULIB_GETPAGESIZE)/g' \
+             -e 's/@''GNULIB_GETPASS''@/$(GL_GNULIB_GETPASS)/g' \
+             -e 's/@''GNULIB_GETUSERSHELL''@/$(GL_GNULIB_GETUSERSHELL)/g' \
+             -e 's/@''GNULIB_GROUP_MEMBER''@/$(GL_GNULIB_GROUP_MEMBER)/g' \
+             -e 's/@''GNULIB_ISATTY''@/$(GL_GNULIB_ISATTY)/g' \
+             -e 's/@''GNULIB_LCHOWN''@/$(GL_GNULIB_LCHOWN)/g' \
+             -e 's/@''GNULIB_LINK''@/$(GL_GNULIB_LINK)/g' \
+             -e 's/@''GNULIB_LINKAT''@/$(GL_GNULIB_LINKAT)/g' \
+             -e 's/@''GNULIB_LSEEK''@/$(GL_GNULIB_LSEEK)/g' \
+             -e 's/@''GNULIB_PIPE''@/$(GL_GNULIB_PIPE)/g' \
+             -e 's/@''GNULIB_PIPE2''@/$(GL_GNULIB_PIPE2)/g' \
+             -e 's/@''GNULIB_PREAD''@/$(GL_GNULIB_PREAD)/g' \
+             -e 's/@''GNULIB_PWRITE''@/$(GL_GNULIB_PWRITE)/g' \
+             -e 's/@''GNULIB_READ''@/$(GL_GNULIB_READ)/g' \
+             -e 's/@''GNULIB_READLINK''@/$(GL_GNULIB_READLINK)/g' \
+             -e 's/@''GNULIB_READLINKAT''@/$(GL_GNULIB_READLINKAT)/g' \
+             -e 's/@''GNULIB_RMDIR''@/$(GL_GNULIB_RMDIR)/g' \
+             -e 's/@''GNULIB_SETHOSTNAME''@/$(GL_GNULIB_SETHOSTNAME)/g' \
+             -e 's/@''GNULIB_SLEEP''@/$(GL_GNULIB_SLEEP)/g' \
+             -e 's/@''GNULIB_SYMLINK''@/$(GL_GNULIB_SYMLINK)/g' \
+             -e 's/@''GNULIB_SYMLINKAT''@/$(GL_GNULIB_SYMLINKAT)/g' \
+             -e 's/@''GNULIB_TRUNCATE''@/$(GL_GNULIB_TRUNCATE)/g' \
+             -e 's/@''GNULIB_TTYNAME_R''@/$(GL_GNULIB_TTYNAME_R)/g' \
+             -e 
's/@''GNULIB_UNISTD_H_GETOPT''@/0$(GL_GNULIB_UNISTD_H_GETOPT)/g' \
+             -e 
's/@''GNULIB_UNISTD_H_NONBLOCKING''@/$(GL_GNULIB_UNISTD_H_NONBLOCKING)/g' \
+             -e 
's/@''GNULIB_UNISTD_H_SIGPIPE''@/$(GL_GNULIB_UNISTD_H_SIGPIPE)/g' \
+             -e 's/@''GNULIB_UNLINK''@/$(GL_GNULIB_UNLINK)/g' \
+             -e 's/@''GNULIB_UNLINKAT''@/$(GL_GNULIB_UNLINKAT)/g' \
+             -e 's/@''GNULIB_USLEEP''@/$(GL_GNULIB_USLEEP)/g' \
+             -e 's/@''GNULIB_WRITE''@/$(GL_GNULIB_WRITE)/g' \
+             -e 's/@''GNULIB_MDA_ACCESS''@/$(GL_GNULIB_MDA_ACCESS)/g' \
+             -e 's/@''GNULIB_MDA_CHDIR''@/$(GL_GNULIB_MDA_CHDIR)/g' \
+             -e 's/@''GNULIB_MDA_CLOSE''@/$(GL_GNULIB_MDA_CLOSE)/g' \
+             -e 's/@''GNULIB_MDA_DUP''@/$(GL_GNULIB_MDA_DUP)/g' \
+             -e 's/@''GNULIB_MDA_DUP2''@/$(GL_GNULIB_MDA_DUP2)/g' \
+             -e 's/@''GNULIB_MDA_EXECL''@/$(GL_GNULIB_MDA_EXECL)/g' \
+             -e 's/@''GNULIB_MDA_EXECLE''@/$(GL_GNULIB_MDA_EXECLE)/g' \
+             -e 's/@''GNULIB_MDA_EXECLP''@/$(GL_GNULIB_MDA_EXECLP)/g' \
+             -e 's/@''GNULIB_MDA_EXECV''@/$(GL_GNULIB_MDA_EXECV)/g' \
+             -e 's/@''GNULIB_MDA_EXECVE''@/$(GL_GNULIB_MDA_EXECVE)/g' \
+             -e 's/@''GNULIB_MDA_EXECVP''@/$(GL_GNULIB_MDA_EXECVP)/g' \
+             -e 's/@''GNULIB_MDA_EXECVPE''@/$(GL_GNULIB_MDA_EXECVPE)/g' \
+             -e 's/@''GNULIB_MDA_GETCWD''@/$(GL_GNULIB_MDA_GETCWD)/g' \
+             -e 's/@''GNULIB_MDA_GETPID''@/$(GL_GNULIB_MDA_GETPID)/g' \
+             -e 's/@''GNULIB_MDA_ISATTY''@/$(GL_GNULIB_MDA_ISATTY)/g' \
+             -e 's/@''GNULIB_MDA_LSEEK''@/$(GL_GNULIB_MDA_LSEEK)/g' \
+             -e 's/@''GNULIB_MDA_READ''@/$(GL_GNULIB_MDA_READ)/g' \
+             -e 's/@''GNULIB_MDA_RMDIR''@/$(GL_GNULIB_MDA_RMDIR)/g' \
+             -e 's/@''GNULIB_MDA_SWAB''@/$(GL_GNULIB_MDA_SWAB)/g' \
+             -e 's/@''GNULIB_MDA_UNLINK''@/$(GL_GNULIB_MDA_UNLINK)/g' \
+             -e 's/@''GNULIB_MDA_WRITE''@/$(GL_GNULIB_MDA_WRITE)/g' \
              < $(srcdir)/unistd.in.h | \
          sed -e 's|@''HAVE_CHOWN''@|$(HAVE_CHOWN)|g' \
              -e 's|@''HAVE_COPY_FILE_RANGE''@|$(HAVE_COPY_FILE_RANGE)|g' \
@@ -3617,49 +3657,49 @@ wchar.h: wchar.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(ARG_NONNULL_H)
              -e 's|@''NEXT_WCHAR_H''@|$(NEXT_WCHAR_H)|g' \
              -e 's|@''HAVE_WCHAR_H''@|$(HAVE_WCHAR_H)|g' \
              -e 's/@''HAVE_CRTDEFS_H''@/$(HAVE_CRTDEFS_H)/g' \
-             -e 's/@''GNULIB_OVERRIDES_WINT_T''@/$(GNULIB_OVERRIDES_WINT_T)/g' 
\
-             -e 's/@''GNULIB_BTOWC''@/$(GNULIB_BTOWC)/g' \
-             -e 's/@''GNULIB_WCTOB''@/$(GNULIB_WCTOB)/g' \
-             -e 's/@''GNULIB_MBSINIT''@/$(GNULIB_MBSINIT)/g' \
-             -e 's/@''GNULIB_MBRTOWC''@/$(GNULIB_MBRTOWC)/g' \
-             -e 's/@''GNULIB_MBRLEN''@/$(GNULIB_MBRLEN)/g' \
-             -e 's/@''GNULIB_MBSRTOWCS''@/$(GNULIB_MBSRTOWCS)/g' \
-             -e 's/@''GNULIB_MBSNRTOWCS''@/$(GNULIB_MBSNRTOWCS)/g' \
-             -e 's/@''GNULIB_WCRTOMB''@/$(GNULIB_WCRTOMB)/g' \
-             -e 's/@''GNULIB_WCSRTOMBS''@/$(GNULIB_WCSRTOMBS)/g' \
-             -e 's/@''GNULIB_WCSNRTOMBS''@/$(GNULIB_WCSNRTOMBS)/g' \
-             -e 's/@''GNULIB_WCWIDTH''@/$(GNULIB_WCWIDTH)/g' \
-             -e 's/@''GNULIB_WMEMCHR''@/$(GNULIB_WMEMCHR)/g' \
-             -e 's/@''GNULIB_WMEMCMP''@/$(GNULIB_WMEMCMP)/g' \
-             -e 's/@''GNULIB_WMEMCPY''@/$(GNULIB_WMEMCPY)/g' \
-             -e 's/@''GNULIB_WMEMMOVE''@/$(GNULIB_WMEMMOVE)/g' \
-             -e 's/@''GNULIB_WMEMPCPY''@/$(GNULIB_WMEMPCPY)/g' \
-             -e 's/@''GNULIB_WMEMSET''@/$(GNULIB_WMEMSET)/g' \
-             -e 's/@''GNULIB_WCSLEN''@/$(GNULIB_WCSLEN)/g' \
-             -e 's/@''GNULIB_WCSNLEN''@/$(GNULIB_WCSNLEN)/g' \
-             -e 's/@''GNULIB_WCSCPY''@/$(GNULIB_WCSCPY)/g' \
-             -e 's/@''GNULIB_WCPCPY''@/$(GNULIB_WCPCPY)/g' \
-             -e 's/@''GNULIB_WCSNCPY''@/$(GNULIB_WCSNCPY)/g' \
-             -e 's/@''GNULIB_WCPNCPY''@/$(GNULIB_WCPNCPY)/g' \
-             -e 's/@''GNULIB_WCSCAT''@/$(GNULIB_WCSCAT)/g' \
-             -e 's/@''GNULIB_WCSNCAT''@/$(GNULIB_WCSNCAT)/g' \
-             -e 's/@''GNULIB_WCSCMP''@/$(GNULIB_WCSCMP)/g' \
-             -e 's/@''GNULIB_WCSNCMP''@/$(GNULIB_WCSNCMP)/g' \
-             -e 's/@''GNULIB_WCSCASECMP''@/$(GNULIB_WCSCASECMP)/g' \
-             -e 's/@''GNULIB_WCSNCASECMP''@/$(GNULIB_WCSNCASECMP)/g' \
-             -e 's/@''GNULIB_WCSCOLL''@/$(GNULIB_WCSCOLL)/g' \
-             -e 's/@''GNULIB_WCSXFRM''@/$(GNULIB_WCSXFRM)/g' \
-             -e 's/@''GNULIB_WCSDUP''@/$(GNULIB_WCSDUP)/g' \
-             -e 's/@''GNULIB_WCSCHR''@/$(GNULIB_WCSCHR)/g' \
-             -e 's/@''GNULIB_WCSRCHR''@/$(GNULIB_WCSRCHR)/g' \
-             -e 's/@''GNULIB_WCSCSPN''@/$(GNULIB_WCSCSPN)/g' \
-             -e 's/@''GNULIB_WCSSPN''@/$(GNULIB_WCSSPN)/g' \
-             -e 's/@''GNULIB_WCSPBRK''@/$(GNULIB_WCSPBRK)/g' \
-             -e 's/@''GNULIB_WCSSTR''@/$(GNULIB_WCSSTR)/g' \
-             -e 's/@''GNULIB_WCSTOK''@/$(GNULIB_WCSTOK)/g' \
-             -e 's/@''GNULIB_WCSWIDTH''@/$(GNULIB_WCSWIDTH)/g' \
-             -e 's/@''GNULIB_WCSFTIME''@/$(GNULIB_WCSFTIME)/g' \
-             -e 's/@''GNULIB_MDA_WCSDUP''@/$(GNULIB_MDA_WCSDUP)/g' \
+             -e 
's/@''GNULIBHEADERS_OVERRIDE_WINT_T''@/$(GNULIBHEADERS_OVERRIDE_WINT_T)/g' \
+             -e 's/@''GNULIB_BTOWC''@/$(GL_GNULIB_BTOWC)/g' \
+             -e 's/@''GNULIB_WCTOB''@/$(GL_GNULIB_WCTOB)/g' \
+             -e 's/@''GNULIB_MBSINIT''@/$(GL_GNULIB_MBSINIT)/g' \
+             -e 's/@''GNULIB_MBRTOWC''@/$(GL_GNULIB_MBRTOWC)/g' \
+             -e 's/@''GNULIB_MBRLEN''@/$(GL_GNULIB_MBRLEN)/g' \
+             -e 's/@''GNULIB_MBSRTOWCS''@/$(GL_GNULIB_MBSRTOWCS)/g' \
+             -e 's/@''GNULIB_MBSNRTOWCS''@/$(GL_GNULIB_MBSNRTOWCS)/g' \
+             -e 's/@''GNULIB_WCRTOMB''@/$(GL_GNULIB_WCRTOMB)/g' \
+             -e 's/@''GNULIB_WCSRTOMBS''@/$(GL_GNULIB_WCSRTOMBS)/g' \
+             -e 's/@''GNULIB_WCSNRTOMBS''@/$(GL_GNULIB_WCSNRTOMBS)/g' \
+             -e 's/@''GNULIB_WCWIDTH''@/$(GL_GNULIB_WCWIDTH)/g' \
+             -e 's/@''GNULIB_WMEMCHR''@/$(GL_GNULIB_WMEMCHR)/g' \
+             -e 's/@''GNULIB_WMEMCMP''@/$(GL_GNULIB_WMEMCMP)/g' \
+             -e 's/@''GNULIB_WMEMCPY''@/$(GL_GNULIB_WMEMCPY)/g' \
+             -e 's/@''GNULIB_WMEMMOVE''@/$(GL_GNULIB_WMEMMOVE)/g' \
+             -e 's/@''GNULIB_WMEMPCPY''@/$(GL_GNULIB_WMEMPCPY)/g' \
+             -e 's/@''GNULIB_WMEMSET''@/$(GL_GNULIB_WMEMSET)/g' \
+             -e 's/@''GNULIB_WCSLEN''@/$(GL_GNULIB_WCSLEN)/g' \
+             -e 's/@''GNULIB_WCSNLEN''@/$(GL_GNULIB_WCSNLEN)/g' \
+             -e 's/@''GNULIB_WCSCPY''@/$(GL_GNULIB_WCSCPY)/g' \
+             -e 's/@''GNULIB_WCPCPY''@/$(GL_GNULIB_WCPCPY)/g' \
+             -e 's/@''GNULIB_WCSNCPY''@/$(GL_GNULIB_WCSNCPY)/g' \
+             -e 's/@''GNULIB_WCPNCPY''@/$(GL_GNULIB_WCPNCPY)/g' \
+             -e 's/@''GNULIB_WCSCAT''@/$(GL_GNULIB_WCSCAT)/g' \
+             -e 's/@''GNULIB_WCSNCAT''@/$(GL_GNULIB_WCSNCAT)/g' \
+             -e 's/@''GNULIB_WCSCMP''@/$(GL_GNULIB_WCSCMP)/g' \
+             -e 's/@''GNULIB_WCSNCMP''@/$(GL_GNULIB_WCSNCMP)/g' \
+             -e 's/@''GNULIB_WCSCASECMP''@/$(GL_GNULIB_WCSCASECMP)/g' \
+             -e 's/@''GNULIB_WCSNCASECMP''@/$(GL_GNULIB_WCSNCASECMP)/g' \
+             -e 's/@''GNULIB_WCSCOLL''@/$(GL_GNULIB_WCSCOLL)/g' \
+             -e 's/@''GNULIB_WCSXFRM''@/$(GL_GNULIB_WCSXFRM)/g' \
+             -e 's/@''GNULIB_WCSDUP''@/$(GL_GNULIB_WCSDUP)/g' \
+             -e 's/@''GNULIB_WCSCHR''@/$(GL_GNULIB_WCSCHR)/g' \
+             -e 's/@''GNULIB_WCSRCHR''@/$(GL_GNULIB_WCSRCHR)/g' \
+             -e 's/@''GNULIB_WCSCSPN''@/$(GL_GNULIB_WCSCSPN)/g' \
+             -e 's/@''GNULIB_WCSSPN''@/$(GL_GNULIB_WCSSPN)/g' \
+             -e 's/@''GNULIB_WCSPBRK''@/$(GL_GNULIB_WCSPBRK)/g' \
+             -e 's/@''GNULIB_WCSSTR''@/$(GL_GNULIB_WCSSTR)/g' \
+             -e 's/@''GNULIB_WCSTOK''@/$(GL_GNULIB_WCSTOK)/g' \
+             -e 's/@''GNULIB_WCSWIDTH''@/$(GL_GNULIB_WCSWIDTH)/g' \
+             -e 's/@''GNULIB_WCSFTIME''@/$(GL_GNULIB_WCSFTIME)/g' \
+             -e 's/@''GNULIB_MDA_WCSDUP''@/$(GL_GNULIB_MDA_WCSDUP)/g' \
              < $(srcdir)/wchar.in.h | \
          sed -e 's|@''HAVE_WINT_T''@|$(HAVE_WINT_T)|g' \
              -e 's|@''HAVE_BTOWC''@|$(HAVE_BTOWC)|g' \
@@ -3760,14 +3800,14 @@ wctype.h: wctype.in.h $(top_builddir)/config.status 
$(CXXDEFS_H) $(WARN_ON_USE_H
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              -e 's|@''NEXT_WCTYPE_H''@|$(NEXT_WCTYPE_H)|g' \
              -e 's/@''HAVE_CRTDEFS_H''@/$(HAVE_CRTDEFS_H)/g' \
-             -e 's/@''GNULIB_OVERRIDES_WINT_T''@/$(GNULIB_OVERRIDES_WINT_T)/g' 
\
-             -e 's/@''GNULIB_ISWBLANK''@/$(GNULIB_ISWBLANK)/g' \
-             -e 's/@''GNULIB_ISWDIGIT''@/$(GNULIB_ISWDIGIT)/g' \
-             -e 's/@''GNULIB_ISWXDIGIT''@/$(GNULIB_ISWXDIGIT)/g' \
-             -e 's/@''GNULIB_WCTYPE''@/$(GNULIB_WCTYPE)/g' \
-             -e 's/@''GNULIB_ISWCTYPE''@/$(GNULIB_ISWCTYPE)/g' \
-             -e 's/@''GNULIB_WCTRANS''@/$(GNULIB_WCTRANS)/g' \
-             -e 's/@''GNULIB_TOWCTRANS''@/$(GNULIB_TOWCTRANS)/g' \
+             -e 
's/@''GNULIBHEADERS_OVERRIDE_WINT_T''@/$(GNULIBHEADERS_OVERRIDE_WINT_T)/g' \
+             -e 's/@''GNULIB_ISWBLANK''@/$(GL_GNULIB_ISWBLANK)/g' \
+             -e 's/@''GNULIB_ISWDIGIT''@/$(GL_GNULIB_ISWDIGIT)/g' \
+             -e 's/@''GNULIB_ISWXDIGIT''@/$(GL_GNULIB_ISWXDIGIT)/g' \
+             -e 's/@''GNULIB_WCTYPE''@/$(GL_GNULIB_WCTYPE)/g' \
+             -e 's/@''GNULIB_ISWCTYPE''@/$(GL_GNULIB_ISWCTYPE)/g' \
+             -e 's/@''GNULIB_WCTRANS''@/$(GL_GNULIB_WCTRANS)/g' \
+             -e 's/@''GNULIB_TOWCTRANS''@/$(GL_GNULIB_TOWCTRANS)/g' \
              -e 's/@''HAVE_ISWBLANK''@/$(HAVE_ISWBLANK)/g' \
              -e 's/@''HAVE_ISWCNTRL''@/$(HAVE_ISWCNTRL)/g' \
              -e 's/@''HAVE_WCTYPE_T''@/$(HAVE_WCTYPE_T)/g' \
diff --git a/lib/accept.c b/lib/accept.c
index 4ec4f43ea..71457dbf6 100644
--- a/lib/accept.c
+++ b/lib/accept.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/accept4.c b/lib/accept4.c
index b444e2227..4c2b80e50 100644
--- a/lib/accept4.c
+++ b/lib/accept4.c
@@ -1,18 +1,18 @@
 /* Accept a connection on a socket, with specific opening flags.
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/alignof.h b/lib/alignof.h
index 6977c3ed2..e6e7a51b2 100644
--- a/lib/alignof.h
+++ b/lib/alignof.h
@@ -1,18 +1,18 @@
 /* Determine alignment of types.
    Copyright (C) 2003-2004, 2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _ALIGNOF_H
 #define _ALIGNOF_H
diff --git a/lib/alloca.c b/lib/alloca.c
index 91b9ec389..48802832a 100644
--- a/lib/alloca.c
+++ b/lib/alloca.c
@@ -1,5 +1,7 @@
 /* alloca.c -- allocate automatically reclaimed memory
-   (Mostly) portable public-domain implementation -- D A Gwyn
+   This file is in the public domain.  */
+
+/* (Mostly) portable implementation -- D A Gwyn
 
    This implementation of the PWB library alloca function,
    which is used to allocate space off the run-time stack so
diff --git a/lib/alloca.in.h b/lib/alloca.in.h
index 9c7ccbb64..65c2d4d93 100644
--- a/lib/alloca.in.h
+++ b/lib/alloca.in.h
@@ -3,20 +3,18 @@
    Copyright (C) 1995, 1999, 2001-2004, 2006-2021 Free Software Foundation,
    Inc.
 
-   This program is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see
-   <https://www.gnu.org/licenses/>.
-  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
    means there is a real alloca function.  */
diff --git a/lib/arpa_inet.in.h b/lib/arpa_inet.in.h
index 0ac83ab91..9968067aa 100644
--- a/lib/arpa_inet.in.h
+++ b/lib/arpa_inet.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2005-2006, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _@GUARD_PREFIX@_ARPA_INET_H
 
diff --git a/lib/asnprintf.c b/lib/asnprintf.c
index 420440a29..c5367b281 100644
--- a/lib/asnprintf.c
+++ b/lib/asnprintf.c
@@ -1,18 +1,18 @@
 /* Formatted output to strings.
    Copyright (C) 1999, 2002, 2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/assure.h b/lib/assure.h
index d95c0c94f..49aa82fec 100644
--- a/lib/assure.h
+++ b/lib/assure.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2014-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/attribute.h b/lib/attribute.h
index 27a0fce5f..80a23f550 100644
--- a/lib/attribute.h
+++ b/lib/attribute.h
@@ -2,15 +2,15 @@
 
    Copyright 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
@@ -32,7 +32,7 @@
 
 
 /* This file defines two types of attributes:
-   * C2X standard attributes.  These have macro names that do not begin with
+   * C2x standard attributes.  These have macro names that do not begin with
      'ATTRIBUTE_'.
    * Selected GCC attributes; see:
      https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
diff --git a/lib/basename-lgpl.c b/lib/basename-lgpl.c
index 405edfa35..5dbd15708 100644
--- a/lib/basename-lgpl.c
+++ b/lib/basename-lgpl.c
@@ -3,12 +3,12 @@
    Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/basename-lgpl.h b/lib/basename-lgpl.h
index 222d21f82..d520c0930 100644
--- a/lib/basename-lgpl.h
+++ b/lib/basename-lgpl.h
@@ -1,20 +1,20 @@
-/*  Extract the last component (base name) of a file name.
+/* Extract the last component (base name) of a file name.
 
-    Copyright (C) 1998, 2001, 2003-2006, 2009-2021 Free Software Foundation,
-    Inc.
+   Copyright (C) 1998, 2001, 2003-2006, 2009-2021 Free Software Foundation,
+   Inc.
 
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU Lesser General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU Lesser General Public License for more details.
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
-    You should have received a copy of the GNU Lesser General Public License
-    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _BASENAME_LGPL_H
 #define _BASENAME_LGPL_H
diff --git a/lib/binary-io.c b/lib/binary-io.c
index 83a820a5d..adc0ae2b0 100644
--- a/lib/binary-io.c
+++ b/lib/binary-io.c
@@ -1,12 +1,12 @@
 /* Binary mode I/O.
    Copyright 2017-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/binary-io.h b/lib/binary-io.h
index 1dfbe5a98..0fa8d546f 100644
--- a/lib/binary-io.h
+++ b/lib/binary-io.h
@@ -1,12 +1,12 @@
 /* Binary mode I/O.
    Copyright (C) 2001, 2003, 2005, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/bind.c b/lib/bind.c
index 87fe0ed11..0e4725446 100644
--- a/lib/bind.c
+++ b/lib/bind.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/btowc.c b/lib/btowc.c
index e800878dd..b8239afae 100644
--- a/lib/btowc.c
+++ b/lib/btowc.c
@@ -2,12 +2,12 @@
    Copyright (C) 2008, 2010-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2008.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/byteswap.in.h b/lib/byteswap.in.h
index c17623888..113f87802 100644
--- a/lib/byteswap.in.h
+++ b/lib/byteswap.in.h
@@ -2,12 +2,12 @@
    Copyright (C) 2005, 2007, 2009-2021 Free Software Foundation, Inc.
    Written by Oskar Liljeblad <oskar@osk.mine.nu>, 2005.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/c-ctype.c b/lib/c-ctype.c
index 5d9d4d87a..300f97c29 100644
--- a/lib/c-ctype.c
+++ b/lib/c-ctype.c
@@ -1,3 +1,21 @@
+/* Character handling in C locale.
+
+   Copyright (C) 2003-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
 #include <config.h>
+
 #define C_CTYPE_INLINE _GL_EXTERN_INLINE
 #include "c-ctype.h"
diff --git a/lib/c-ctype.h b/lib/c-ctype.h
index e8403dbda..3a652ac1f 100644
--- a/lib/c-ctype.h
+++ b/lib/c-ctype.h
@@ -7,18 +7,18 @@
 
    Copyright (C) 2000-2003, 2006, 2008-2021 Free Software Foundation, Inc.
 
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU Lesser General Public License for more details.
-
-You should have received a copy of the GNU Lesser General Public License
-along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef C_CTYPE_H
 #define C_CTYPE_H
diff --git a/lib/c-strcase.h b/lib/c-strcase.h
index 8240dbcf4..82f99bb06 100644
--- a/lib/c-strcase.h
+++ b/lib/c-strcase.h
@@ -2,18 +2,18 @@
    Copyright (C) 1995-1996, 2001, 2003, 2005, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef C_STRCASE_H
 #define C_STRCASE_H
diff --git a/lib/c-strcasecmp.c b/lib/c-strcasecmp.c
index 805dc990b..3c2245508 100644
--- a/lib/c-strcasecmp.c
+++ b/lib/c-strcasecmp.c
@@ -1,18 +1,18 @@
 /* c-strcasecmp.c -- case insensitive string comparator in C locale
    Copyright (C) 1998-1999, 2005-2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/c-strcaseeq.h b/lib/c-strcaseeq.h
index ed979aa6c..66b9cf3c1 100644
--- a/lib/c-strcaseeq.h
+++ b/lib/c-strcaseeq.h
@@ -1,15 +1,15 @@
 /* Optimized case-insensitive string comparison in C locale.
    Copyright (C) 2001-2002, 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
diff --git a/lib/c-strncasecmp.c b/lib/c-strncasecmp.c
index c3203fddf..f3ca786cb 100644
--- a/lib/c-strncasecmp.c
+++ b/lib/c-strncasecmp.c
@@ -1,18 +1,18 @@
 /* c-strncasecmp.c -- case insensitive string comparator in C locale
    Copyright (C) 1998-1999, 2005-2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/cdefs.h b/lib/cdefs.h
index 90f97412a..b883b2566 100644
--- a/lib/cdefs.h
+++ b/lib/cdefs.h
@@ -259,10 +259,12 @@
 # define __attribute_const__ /* Ignore */
 #endif
 
-#if defined __STDC_VERSION__ && 201710L < __STDC_VERSION__
-# define __attribute_maybe_unused__ [[__maybe_unused__]]
-#elif __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__)
+#if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__)
 # define __attribute_maybe_unused__ __attribute__ ((__unused__))
+/* Once the next version of the C standard comes out, we can
+   do something like the following here:
+   #elif defined __STDC_VERSION__ && 202???L <= __STDC_VERSION__
+   # define __attribute_maybe_unused__ [[__maybe_unused__]]   */
 #else
 # define __attribute_maybe_unused__ /* Ignore */
 #endif
@@ -320,7 +322,9 @@
 #endif
 
 /* The nonnull function attribute marks pointer parameters that
-   must not be NULL.  */
+   must not be NULL.  This has the name __nonnull in glibc,
+   and __attribute_nonnull__ in files shared with Gnulib to avoid
+   collision with a different __nonnull in DragonFlyBSD 5.9.  */
 #ifndef __attribute_nonnull__
 # if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__)
 #  define __attribute_nonnull__(params) __attribute__ ((__nonnull__ params))
@@ -485,9 +489,9 @@
       [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
 #endif
 
-/* The #ifndef lets Gnulib avoid including these on non-glibc
-   platforms, where the includes typically do not exist.  */
-#ifndef __WORDSIZE
+/* Gnulib avoids including these, as they don't work on non-glibc or
+   older glibc platforms.  */
+#ifndef __GNULIB_CDEFS
 # include <bits/wordsize.h>
 # include <bits/long-double.h>
 #endif
diff --git a/lib/ceil.c b/lib/ceil.c
index 06e7e5e31..fce05d986 100644
--- a/lib/ceil.c
+++ b/lib/ceil.c
@@ -1,12 +1,12 @@
 /* Round towards positive infinity.
    Copyright (C) 2007, 2010-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/cloexec.c b/lib/cloexec.c
index 1f58b721e..7defa9344 100644
--- a/lib/cloexec.c
+++ b/lib/cloexec.c
@@ -2,20 +2,20 @@
 
    Copyright (C) 1991, 2004-2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
-   The code is taken from glibc/manual/llio.texi  */
+/* The code is taken from glibc/manual/llio.texi  */
 
 #include <config.h>
 
diff --git a/lib/cloexec.h b/lib/cloexec.h
index 7a71ad4f3..97a3659ef 100644
--- a/lib/cloexec.h
+++ b/lib/cloexec.h
@@ -2,20 +2,18 @@
 
    Copyright (C) 2004, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-*/
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <stdbool.h>
 
diff --git a/lib/close.c b/lib/close.c
index 11e31dbbf..5b9ab6c9f 100644
--- a/lib/close.c
+++ b/lib/close.c
@@ -1,12 +1,12 @@
 /* close replacement.
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/connect.c b/lib/connect.c
index fe0de7e6c..b2b2e9334 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/copysign.c b/lib/copysign.c
index ad5b1020e..fee131be1 100644
--- a/lib/copysign.c
+++ b/lib/copysign.c
@@ -1,12 +1,12 @@
 /* Copy sign into another 'double' number.
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/dirent.in.h b/lib/dirent.in.h
index a285bdecc..647a3dba5 100644
--- a/lib/dirent.in.h
+++ b/lib/dirent.in.h
@@ -1,12 +1,12 @@
 /* A GNU-like <dirent.h>.
    Copyright (C) 2006-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/dirfd.c b/lib/dirfd.c
index 7da640fc6..640cb4ff1 100644
--- a/lib/dirfd.c
+++ b/lib/dirfd.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2001, 2006, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/dirname-lgpl.c b/lib/dirname-lgpl.c
index 9cc5db75e..95f9c9919 100644
--- a/lib/dirname-lgpl.c
+++ b/lib/dirname-lgpl.c
@@ -3,12 +3,12 @@
    Copyright (C) 1990, 1998, 2000-2001, 2003-2006, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/dirname.h b/lib/dirname.h
index dce18598a..04f823eca 100644
--- a/lib/dirname.h
+++ b/lib/dirname.h
@@ -1,26 +1,27 @@
-/*  Take file names apart into directory and base names.
+/* Take file names apart into directory and base names.
 
-    Copyright (C) 1998, 2001, 2003-2006, 2009-2021 Free Software Foundation,
-    Inc.
+   Copyright (C) 1998, 2001, 2003-2006, 2009-2021 Free Software Foundation,
+   Inc.
 
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU Lesser General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU Lesser General Public License for more details.
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
-    You should have received a copy of the GNU Lesser General Public License
-    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef DIRNAME_H_
 # define DIRNAME_H_ 1
 
 # include <stdbool.h>
 # include <stddef.h>
+# include <stdlib.h>
 # include "filename.h"
 # include "basename-lgpl.h"
 
@@ -33,11 +34,16 @@ extern "C" {
 #endif
 
 # if GNULIB_DIRNAME
-char *base_name (char const *file) _GL_ATTRIBUTE_MALLOC;
-char *dir_name (char const *file);
+char *base_name (char const *file)
+  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
+  _GL_ATTRIBUTE_RETURNS_NONNULL;
+char *dir_name (char const *file)
+  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
+  _GL_ATTRIBUTE_RETURNS_NONNULL;
 # endif
 
-char *mdir_name (char const *file);
+char *mdir_name (char const *file)
+  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE;
 size_t dir_len (char const *file) _GL_ATTRIBUTE_PURE;
 
 bool strip_trailing_slashes (char *file);
diff --git a/lib/dup2.c b/lib/dup2.c
index 653ef8995..53e555213 100644
--- a/lib/dup2.c
+++ b/lib/dup2.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 1999, 2004-2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/duplocale.c b/lib/duplocale.c
index 430634dbe..bc8740d4f 100644
--- a/lib/duplocale.c
+++ b/lib/duplocale.c
@@ -1,12 +1,12 @@
 /* Duplicate a locale object.
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/dynarray.h b/lib/dynarray.h
index 5db6ed95b..ec64273b3 100644
--- a/lib/dynarray.h
+++ b/lib/dynarray.h
@@ -1,12 +1,12 @@
 /* Type-safe arrays which grow dynamically.
    Copyright 2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
@@ -257,18 +257,22 @@ static DYNARRAY_ELEMENT *
 
 #if defined DYNARRAY_STRUCT || defined DYNARRAY_ELEMENT || defined 
DYNARRAY_PREFIX
 
-# include <libc-config.h>
+# ifndef _GL_LIKELY
+/* Rely on __builtin_expect, as provided by the module 'builtin-expect'.  */
+#  define _GL_LIKELY(cond) __builtin_expect ((cond), 1)
+#  define _GL_UNLIKELY(cond) __builtin_expect ((cond), 0)
+# endif
 
 /* Define auxiliary structs and declare auxiliary functions, common to all
    instantiations of dynarray.  */
-# include <malloc/dynarray.h>
+# include <malloc/dynarray.gl.h>
 
 /* Define the instantiation, specified through
      DYNARRAY_STRUCT
      DYNARRAY_ELEMENT
      DYNARRAY_PREFIX
    etc.  */
-# include <malloc/dynarray-skeleton.c>
+# include <malloc/dynarray-skeleton.gl.h>
 
 #else
 
diff --git a/lib/errno.in.h b/lib/errno.in.h
index 0ae2aceca..3cad9e2d6 100644
--- a/lib/errno.in.h
+++ b/lib/errno.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _@GUARD_PREFIX@_ERRNO_H
 
diff --git a/lib/fcntl.c b/lib/fcntl.c
index e6c4b8e68..c744eb91e 100644
--- a/lib/fcntl.c
+++ b/lib/fcntl.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/fcntl.in.h b/lib/fcntl.in.h
index 7254a5619..26dedc304 100644
--- a/lib/fcntl.in.h
+++ b/lib/fcntl.in.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2006-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/fd-hook.c b/lib/fd-hook.c
index f8e278158..75b1626de 100644
--- a/lib/fd-hook.c
+++ b/lib/fd-hook.c
@@ -2,15 +2,15 @@
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2009.
 
-   This program is free software: you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
diff --git a/lib/fd-hook.h b/lib/fd-hook.h
index 0005db7aa..98e2a5263 100644
--- a/lib/fd-hook.h
+++ b/lib/fd-hook.h
@@ -1,15 +1,15 @@
 /* Hook for making file descriptor functions close(), ioctl() extensible.
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
diff --git a/lib/float+.h b/lib/float+.h
index d814bf196..ad891f65d 100644
--- a/lib/float+.h
+++ b/lib/float+.h
@@ -2,18 +2,18 @@
    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2007.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _FLOATPLUS_H
 #define _FLOATPLUS_H
diff --git a/lib/float.c b/lib/float.c
index 5c16d6110..dd1e84ad1 100644
--- a/lib/float.c
+++ b/lib/float.c
@@ -2,12 +2,12 @@
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2011.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/float.in.h b/lib/float.in.h
index 1179df594..f52aba36e 100644
--- a/lib/float.in.h
+++ b/lib/float.in.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/floor.c b/lib/floor.c
index 9f13d1631..15303004f 100644
--- a/lib/floor.c
+++ b/lib/floor.c
@@ -1,12 +1,12 @@
 /* Round towards negative infinity.
    Copyright (C) 2007, 2010-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/free.c b/lib/free.c
index b22124154..780f03dd1 100644
--- a/lib/free.c
+++ b/lib/free.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2003, 2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/frexp.c b/lib/frexp.c
index 55340b8d4..ab5f34315 100644
--- a/lib/frexp.c
+++ b/lib/frexp.c
@@ -1,12 +1,12 @@
 /* Split a double into fraction and mantissa.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/fstat.c b/lib/fstat.c
index 30440d623..512c688c4 100644
--- a/lib/fstat.c
+++ b/lib/fstat.c
@@ -1,12 +1,12 @@
 /* fstat() replacement.
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/fsync.c b/lib/fsync.c
index 71fcddecc..99a932d77 100644
--- a/lib/fsync.c
+++ b/lib/fsync.c
@@ -9,15 +9,15 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This library is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
diff --git a/lib/full-read.c b/lib/full-read.c
index 32ff1a54a..53be6596a 100644
--- a/lib/full-read.c
+++ b/lib/full-read.c
@@ -1,12 +1,12 @@
 /* An interface to read that retries after partial reads and interrupts.
    Copyright (C) 2002-2003, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/full-read.h b/lib/full-read.h
index 450d645d1..b36f2e169 100644
--- a/lib/full-read.h
+++ b/lib/full-read.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2002, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/full-write.c b/lib/full-write.c
index acbfc3121..614ca0b4f 100644
--- a/lib/full-write.c
+++ b/lib/full-write.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 1993-1994, 1997-2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/full-write.h b/lib/full-write.h
index 1220d05de..c316224b4 100644
--- a/lib/full-write.h
+++ b/lib/full-write.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2002-2003, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/gai_strerror.c b/lib/gai_strerror.c
index 907e8e6da..4874ef5e3 100644
--- a/lib/gai_strerror.c
+++ b/lib/gai_strerror.c
@@ -3,18 +3,18 @@
    This file is part of the GNU C Library.
    Contributed by Philip Blundell <pjb27@cam.ac.uk>, 1997.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _LIBC
 # include <config.h>
diff --git a/lib/getaddrinfo.c b/lib/getaddrinfo.c
index 05fc59e8d..0c42d1b7b 100644
--- a/lib/getaddrinfo.c
+++ b/lib/getaddrinfo.c
@@ -2,18 +2,18 @@
    Copyright (C) 1997, 2001-2002, 2004-2021 Free Software Foundation, Inc.
    Contributed by Simon Josefsson <simon@josefsson.org>.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Don't use __attribute__ __nonnull__ in this compilation unit.  Otherwise gcc
    optimizes away the sa == NULL test below.  */
diff --git a/lib/getdtablesize.c b/lib/getdtablesize.c
index 918db9dd4..5006c2d5c 100644
--- a/lib/getdtablesize.c
+++ b/lib/getdtablesize.c
@@ -2,12 +2,12 @@
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2008.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/getlogin.c b/lib/getlogin.c
index 4a7099450..7b78c67ce 100644
--- a/lib/getlogin.c
+++ b/lib/getlogin.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/getpeername.c b/lib/getpeername.c
index 5d9cf79ea..468bb3d7c 100644
--- a/lib/getpeername.c
+++ b/lib/getpeername.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/getrandom.c b/lib/getrandom.c
index b467caa7a..a186c4d3b 100644
--- a/lib/getrandom.c
+++ b/lib/getrandom.c
@@ -2,12 +2,12 @@
 
    Copyright 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
@@ -178,7 +178,11 @@ getrandom (void *buffer, size_t length, unsigned int flags)
                     + (flags & GRND_NONBLOCK ? O_NONBLOCK : 0));
       fd = open (randdevice[devrandom], oflags);
       if (fd < 0)
-        return fd;
+        {
+          if (errno == ENOENT || errno == ENOTDIR)
+            errno = ENOSYS;
+          return -1;
+        }
       randfd[devrandom] = fd;
     }
 
diff --git a/lib/getsockname.c b/lib/getsockname.c
index 83c1b7dcf..d1f17b3ed 100644
--- a/lib/getsockname.c
+++ b/lib/getsockname.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/getsockopt.c b/lib/getsockopt.c
index cec49330c..b92d034bb 100644
--- a/lib/getsockopt.c
+++ b/lib/getsockopt.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/gettext.h b/lib/gettext.h
index dd05cdaa5..f1c7a2407 100644
--- a/lib/gettext.h
+++ b/lib/gettext.h
@@ -2,18 +2,18 @@
    Copyright (C) 1995-1998, 2000-2002, 2004-2006, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _LIBGETTEXT_H
 #define _LIBGETTEXT_H 1
diff --git a/lib/hard-locale.c b/lib/hard-locale.c
index ab3610d29..8b6802d10 100644
--- a/lib/hard-locale.c
+++ b/lib/hard-locale.c
@@ -3,12 +3,12 @@
    Copyright (C) 1997-1999, 2002-2004, 2006-2007, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/hard-locale.h b/lib/hard-locale.h
index c4449f912..eba66018c 100644
--- a/lib/hard-locale.h
+++ b/lib/hard-locale.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 1999, 2003-2004, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/iconv.c b/lib/iconv.c
index f3480aad6..bf5149349 100644
--- a/lib/iconv.c
+++ b/lib/iconv.c
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 1999-2001, 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/iconv.in.h b/lib/iconv.in.h
index 0fc0fa7c8..3a2f94e75 100644
--- a/lib/iconv.in.h
+++ b/lib/iconv.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _@GUARD_PREFIX@_ICONV_H
 
diff --git a/lib/iconv_close.c b/lib/iconv_close.c
index bc40feccd..7429b925b 100644
--- a/lib/iconv_close.c
+++ b/lib/iconv_close.c
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/iconv_open-aix.gperf b/lib/iconv_open-aix.gperf
index 20ce70a0f..d07375914 100644
--- a/lib/iconv_open-aix.gperf
+++ b/lib/iconv_open-aix.gperf
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2007, 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 struct mapping { int standard_name; const char vendor_name[10 + 1]; };
 %struct-type
diff --git a/lib/iconv_open-hpux.gperf b/lib/iconv_open-hpux.gperf
index 921c722ed..f4664d615 100644
--- a/lib/iconv_open-hpux.gperf
+++ b/lib/iconv_open-hpux.gperf
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2007, 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 struct mapping { int standard_name; const char vendor_name[9 + 1]; };
 %struct-type
diff --git a/lib/iconv_open-irix.gperf b/lib/iconv_open-irix.gperf
index 6241de60d..9885d9278 100644
--- a/lib/iconv_open-irix.gperf
+++ b/lib/iconv_open-irix.gperf
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2007, 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 struct mapping { int standard_name; const char vendor_name[10 + 1]; };
 %struct-type
diff --git a/lib/iconv_open-osf.gperf b/lib/iconv_open-osf.gperf
index 97d570ced..d818d79dc 100644
--- a/lib/iconv_open-osf.gperf
+++ b/lib/iconv_open-osf.gperf
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2007, 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 struct mapping { int standard_name; const char vendor_name[10 + 1]; };
 %struct-type
diff --git a/lib/iconv_open-solaris.gperf b/lib/iconv_open-solaris.gperf
index 0283aba22..648dd3afb 100644
--- a/lib/iconv_open-solaris.gperf
+++ b/lib/iconv_open-solaris.gperf
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2007, 2009, 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 struct mapping { int standard_name; const char vendor_name[10 + 1]; };
 %struct-type
diff --git a/lib/iconv_open-zos.gperf b/lib/iconv_open-zos.gperf
index faf5d65da..1c3552e0f 100644
--- a/lib/iconv_open-zos.gperf
+++ b/lib/iconv_open-zos.gperf
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 struct mapping { int standard_name; const char vendor_name[10 + 1]; };
 %struct-type
diff --git a/lib/iconv_open.c b/lib/iconv_open.c
index 304592ec5..e573556e9 100644
--- a/lib/iconv_open.c
+++ b/lib/iconv_open.c
@@ -1,18 +1,18 @@
 /* Character set conversion.
    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/iconveh.h b/lib/iconveh.h
index b2be8fa93..cbf692ebe 100644
--- a/lib/iconveh.h
+++ b/lib/iconveh.h
@@ -2,12 +2,12 @@
    Copyright (C) 2001-2007, 2009-2021 Free Software Foundation, Inc.
    Written by Bruno Haible.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/inet_ntop.c b/lib/inet_ntop.c
index 5b9ea1172..409e88c76 100644
--- a/lib/inet_ntop.c
+++ b/lib/inet_ntop.c
@@ -2,18 +2,18 @@
 
    Copyright (C) 2005-2006, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /*
  * Copyright (c) 1996-1999 by Internet Software Consortium.
diff --git a/lib/inet_pton.c b/lib/inet_pton.c
index 57dc7dc40..14e8b0acd 100644
--- a/lib/inet_pton.c
+++ b/lib/inet_pton.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2006, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/inttypes.in.h b/lib/inttypes.in.h
index fe0af82f8..41cb4220c 100644
--- a/lib/inttypes.in.h
+++ b/lib/inttypes.in.h
@@ -2,12 +2,12 @@
    Written by Paul Eggert, Bruno Haible, Derek Price.
    This file is part of gnulib.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/isfinite.c b/lib/isfinite.c
index cfd2d33f0..f1373b90e 100644
--- a/lib/isfinite.c
+++ b/lib/isfinite.c
@@ -1,18 +1,18 @@
 /* Test for finite value (zero, subnormal, or normal, and not infinite or NaN).
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Ben Pfaff <blp@gnu.org>, 2007. */
 
diff --git a/lib/isinf.c b/lib/isinf.c
index 6d4dfc0ac..62becf22d 100644
--- a/lib/isinf.c
+++ b/lib/isinf.c
@@ -1,18 +1,18 @@
 /* Test for positive or negative infinity.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Ben Pfaff <blp@gnu.org>, 2008. */
 
diff --git a/lib/isnan.c b/lib/isnan.c
index 2282269e0..ed3452f90 100644
--- a/lib/isnan.c
+++ b/lib/isnan.c
@@ -1,12 +1,12 @@
 /* Test for NaN that does not need libm.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/isnand-nolibm.h b/lib/isnand-nolibm.h
index fbed47489..df64f4e17 100644
--- a/lib/isnand-nolibm.h
+++ b/lib/isnand-nolibm.h
@@ -1,12 +1,12 @@
 /* Test for NaN that does not need libm.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/isnand.c b/lib/isnand.c
index f359130ba..7c5df9072 100644
--- a/lib/isnand.c
+++ b/lib/isnand.c
@@ -1,12 +1,12 @@
 /* Test for NaN that does not need libm.
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/isnanf-nolibm.h b/lib/isnanf-nolibm.h
index ba609d5d3..bd858117b 100644
--- a/lib/isnanf-nolibm.h
+++ b/lib/isnanf-nolibm.h
@@ -1,12 +1,12 @@
 /* Test for NaN that does not need libm.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/isnanf.c b/lib/isnanf.c
index 94a32e5a1..3b60340a2 100644
--- a/lib/isnanf.c
+++ b/lib/isnanf.c
@@ -1,12 +1,12 @@
 /* Test for NaN that does not need libm.
    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/isnanl-nolibm.h b/lib/isnanl-nolibm.h
index 797c06b43..41fe15699 100644
--- a/lib/isnanl-nolibm.h
+++ b/lib/isnanl-nolibm.h
@@ -1,12 +1,12 @@
 /* Test for NaN that does not need libm.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/isnanl.c b/lib/isnanl.c
index b4595605f..e8dedf0f4 100644
--- a/lib/isnanl.c
+++ b/lib/isnanl.c
@@ -1,12 +1,12 @@
 /* Test for NaN that does not need libm.
    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/itold.c b/lib/itold.c
index f52216a88..798486636 100644
--- a/lib/itold.c
+++ b/lib/itold.c
@@ -2,12 +2,12 @@
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2011.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/langinfo.in.h b/lib/langinfo.in.h
index e8ac12c3c..4873899d8 100644
--- a/lib/langinfo.in.h
+++ b/lib/langinfo.in.h
@@ -1,18 +1,18 @@
 /* Substitute for and wrapper around <langinfo.h>.
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /*
  * POSIX <langinfo.h> for platforms that lack it or have an incomplete one.
diff --git a/lib/lc-charset-dispatch.c b/lib/lc-charset-dispatch.c
index 98c6e9de7..88a0bd325 100644
--- a/lib/lc-charset-dispatch.c
+++ b/lib/lc-charset-dispatch.c
@@ -1,12 +1,12 @@
 /* Dispatching based on the current locale's character encoding.
    Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/lc-charset-dispatch.h b/lib/lc-charset-dispatch.h
index d9d1ac161..59b485de4 100644
--- a/lib/lc-charset-dispatch.h
+++ b/lib/lc-charset-dispatch.h
@@ -1,12 +1,12 @@
 /* Dispatching based on the current locale's character encoding.
    Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/libc-config.h b/lib/libc-config.h
index f14013f7e..f68749fc7 100644
--- a/lib/libc-config.h
+++ b/lib/libc-config.h
@@ -28,7 +28,10 @@
 
    When compiled as part of glibc this is a no-op; when compiled as
    part of Gnulib this includes Gnulib's <config.h> and defines macros
-   that glibc library code would normally assume.  */
+   that glibc library code would normally assume.
+
+   Note: This header file MUST NOT be included by public header files
+   of Gnulib.  */
 
 #include <config.h>
 
@@ -71,7 +74,7 @@
 # endif
 #endif
 
-#ifndef __attribute_maybe_unused__
+#ifndef __attribute_nonnull__
 /* <sys/cdefs.h> either does not exist, or is too old for Gnulib.
    Prepare to include <cdefs.h>, which is Gnulib's version of a
    more-recent glibc <sys/cdefs.h>.  */
@@ -80,13 +83,9 @@
 # ifndef _FEATURES_H
 #  define _FEATURES_H 1
 # endif
-/* Define __WORDSIZE so that <cdefs.h> does not attempt to include
-   nonexistent files.  Make it a syntax error, since Gnulib does not
-   use __WORDSIZE now, and if Gnulib uses it later the syntax error
-   will let us know that __WORDSIZE needs configuring.  */
-# ifndef __WORDSIZE
-#  define __WORDSIZE %%%
-# endif
+/* Define __GNULIB_CDEFS so that <cdefs.h> does not attempt to include
+   nonexistent files.  */
+# define __GNULIB_CDEFS
 /* Undef the macros unconditionally defined by our copy of glibc
    <sys/cdefs.h>, so that they do not clash with any system-defined
    versions.  */
diff --git a/lib/libunistring.valgrind b/lib/libunistring.valgrind
index 712c39a9d..9eee19afa 100644
--- a/lib/libunistring.valgrind
+++ b/lib/libunistring.valgrind
@@ -2,18 +2,26 @@
 
 # Copyright (C) 2010-2021 Free Software Foundation, Inc.
 #
-# This program is free software: you can redistribute it and/or modify it
-# under the terms of the GNU Lesser General Public License as published
-# by the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
+# This file is free software.
+# It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
+# You can redistribute it and/or modify it under either
+#   - the terms of the GNU Lesser General Public License as published
+#     by the Free Software Foundation; either version 3, or (at your
+#     option) any later version, or
+#   - the terms of the GNU General Public License as published by the
+#     Free Software Foundation; either version 2, or (at your option)
+#     any later version, or
+#   - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# Lesser General Public License for more details.
+# Lesser General Public License and the GNU General Public License
+# for more details.
 #
-# You should have received a copy of the GNU Lesser General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU Lesser General Public
+# License and of the GNU General Public License along with this
+# program.  If not, see <https://www.gnu.org/licenses/>.
 
 # Suppress a valgrind message about use of uninitialized memory in freea().
 # This use is OK because it provides only a speedup.
diff --git a/lib/limits.in.h b/lib/limits.in.h
index 4675ba4b2..2ecafebb0 100644
--- a/lib/limits.in.h
+++ b/lib/limits.in.h
@@ -2,18 +2,18 @@
 
    Copyright 2016-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public License
-   as published by the Free Software Foundation; either version 2, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
@@ -99,10 +99,11 @@
 # endif
 #endif
 
-/* Macros specified by ISO/IEC TS 18661-1:2014.  */
+/* Macros specified by C2x and by ISO/IEC TS 18661-1:2014.  */
 
 #if (! defined ULLONG_WIDTH                                             \
-     && (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__))
+     && (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__ \
+         || (defined __STDC_VERSION__ && 201710 < __STDC_VERSION__)))
 # define CHAR_WIDTH _GL_INTEGER_WIDTH (CHAR_MIN, CHAR_MAX)
 # define SCHAR_WIDTH _GL_INTEGER_WIDTH (SCHAR_MIN, SCHAR_MAX)
 # define UCHAR_WIDTH _GL_INTEGER_WIDTH (0, UCHAR_MAX)
@@ -114,7 +115,16 @@
 # define ULONG_WIDTH _GL_INTEGER_WIDTH (0, ULONG_MAX)
 # define LLONG_WIDTH _GL_INTEGER_WIDTH (LLONG_MIN, LLONG_MAX)
 # define ULLONG_WIDTH _GL_INTEGER_WIDTH (0, ULLONG_MAX)
-#endif /* !ULLONG_WIDTH && (_GNU_SOURCE || __STDC_WANT_IEC_60559_BFP_EXT__) */
+#endif
+
+/* Macros specified by C2x.  */
+
+#if (! defined BOOL_WIDTH \
+     && (defined _GNU_SOURCE \
+         || (defined __STDC_VERSION__ && 201710 < __STDC_VERSION__)))
+# define BOOL_MAX 1
+# define BOOL_WIDTH 1
+#endif
 
 #endif /* _@GUARD_PREFIX@_LIMITS_H */
 #endif /* _@GUARD_PREFIX@_LIMITS_H */
diff --git a/lib/link.c b/lib/link.c
index 3ba897a8b..bd4bef9f8 100644
--- a/lib/link.c
+++ b/lib/link.c
@@ -2,18 +2,18 @@
 
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/listen.c b/lib/listen.c
index ccf881ca3..a145f82c5 100644
--- a/lib/listen.c
+++ b/lib/listen.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/localcharset.c b/lib/localcharset.c
index 87a5979a3..9c22050dc 100644
--- a/lib/localcharset.c
+++ b/lib/localcharset.c
@@ -2,18 +2,18 @@
 
    Copyright (C) 2000-2006, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Bruno Haible <bruno@clisp.org>.  */
 
diff --git a/lib/localcharset.h b/lib/localcharset.h
index c2c1c6783..27c3ab60e 100644
--- a/lib/localcharset.h
+++ b/lib/localcharset.h
@@ -2,18 +2,18 @@
    Copyright (C) 2000-2003, 2009-2021 Free Software Foundation, Inc.
    This file is part of the GNU CHARSET Library.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _LOCALCHARSET_H
 #define _LOCALCHARSET_H
diff --git a/lib/locale.in.h b/lib/locale.in.h
index 4eb3c80ed..106307069 100644
--- a/lib/locale.in.h
+++ b/lib/locale.in.h
@@ -1,12 +1,12 @@
 /* A POSIX <locale.h>.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/localeconv.c b/lib/localeconv.c
index cdcaf866c..25e95a112 100644
--- a/lib/localeconv.c
+++ b/lib/localeconv.c
@@ -1,12 +1,12 @@
 /* Query locale dependent information for formatting numbers.
    Copyright (C) 2012-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/log.c b/lib/log.c
index 03e9ac97d..3f142e88d 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -1,12 +1,12 @@
 /* Logarithm.
    Copyright (C) 2012-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/log1p.c b/lib/log1p.c
index 0e514984c..c45c6ff34 100644
--- a/lib/log1p.c
+++ b/lib/log1p.c
@@ -1,12 +1,12 @@
 /* Natural logarithm of 1 plus argument.
    Copyright (C) 2012-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/lstat.c b/lib/lstat.c
index d414d3af7..7de0bf102 100644
--- a/lib/lstat.c
+++ b/lib/lstat.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 1997-2006, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/malloc.c b/lib/malloc.c
index 6bbb97dc2..0d8b3596c 100644
--- a/lib/malloc.c
+++ b/lib/malloc.c
@@ -2,61 +2,50 @@
 
    Copyright (C) 1997-1998, 2006-2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* written by Jim Meyering and Bruno Haible */
 
 #define _GL_USE_STDLIB_ALLOC 1
 #include <config.h>
-/* Only the AC_FUNC_MALLOC macro defines 'malloc' already in config.h.  */
-#ifdef malloc
-# define NEED_MALLOC_GNU 1
-# undef malloc
-/* Whereas the gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU.  */
-#elif GNULIB_MALLOC_GNU && !HAVE_MALLOC_GNU
-# define NEED_MALLOC_GNU 1
-#endif
 
 #include <stdlib.h>
 
-/* A function definition is only needed if NEED_MALLOC_GNU is defined above
-   or if the module 'malloc-posix' requests it.  */
-#if NEED_MALLOC_GNU || (GNULIB_MALLOC_POSIX && !HAVE_MALLOC_POSIX)
+#include <errno.h>
 
-# include <errno.h>
+#include "xalloc-oversized.h"
 
-/* Allocate an N-byte block of memory from the heap.
-   If N is zero, allocate a 1-byte block.  */
+/* Allocate an N-byte block of memory from the heap, even if N is 0.  */
 
 void *
 rpl_malloc (size_t n)
 {
-  void *result;
-
-# if NEED_MALLOC_GNU
   if (n == 0)
     n = 1;
-# endif
 
-  result = malloc (n);
+  if (xalloc_oversized (n, 1))
+    {
+      errno = ENOMEM;
+      return NULL;
+    }
+
+  void *result = malloc (n);
 
-# if !HAVE_MALLOC_POSIX
+#if !HAVE_MALLOC_POSIX
   if (result == NULL)
     errno = ENOMEM;
-# endif
+#endif
 
   return result;
 }
-
-#endif
diff --git a/lib/malloca.c b/lib/malloca.c
index a546b306a..b4884234a 100644
--- a/lib/malloca.c
+++ b/lib/malloca.c
@@ -2,18 +2,18 @@
    Copyright (C) 2003, 2006-2007, 2009-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2003, 2018.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #define _GL_USE_STDLIB_ALLOC 1
 #include <config.h>
@@ -21,6 +21,8 @@
 /* Specification.  */
 #include "malloca.h"
 
+#include "idx.h"
+#include "intprops.h"
 #include "verify.h"
 
 /* The speed critical point in this file is freea() applied to an alloca()
@@ -45,24 +47,30 @@ mmalloca (size_t n)
 #if HAVE_ALLOCA
   /* Allocate one more word, used to determine the address to pass to freea(),
      and room for the alignment ≡ sa_alignment_max mod 2*sa_alignment_max.  */
-  size_t nplus = n + sizeof (small_t) + 2 * sa_alignment_max - 1;
-
-  if (nplus >= n)
+  uintptr_t alignment2_mask = 2 * sa_alignment_max - 1;
+  int plus = sizeof (small_t) + alignment2_mask;
+  idx_t nplus;
+  if (!INT_ADD_WRAPV (n, plus, &nplus) && !xalloc_oversized (nplus, 1))
     {
       char *mem = (char *) malloc (nplus);
 
       if (mem != NULL)
         {
-          char *p =
-            (char *)((((uintptr_t)mem + sizeof (small_t) + sa_alignment_max - 
1)
-                      & ~(uintptr_t)(2 * sa_alignment_max - 1))
-                     + sa_alignment_max);
+          uintptr_t umem = (uintptr_t)mem, umemplus;
+          /* The INT_ADD_WRAPV avoids signed integer overflow on
+             theoretical platforms where UINTPTR_MAX <= INT_MAX.  */
+          INT_ADD_WRAPV (umem, sizeof (small_t) + sa_alignment_max - 1,
+                         &umemplus);
+          idx_t offset = ((umemplus & ~alignment2_mask)
+                          + sa_alignment_max - umem);
+          void *vp = mem + offset;
+          small_t *p = vp;
           /* Here p >= mem + sizeof (small_t),
              and p <= mem + sizeof (small_t) + 2 * sa_alignment_max - 1
              hence p + n <= mem + nplus.
              So, the memory range [p, p+n) lies in the allocated memory range
              [mem, mem + nplus).  */
-          ((small_t *) p)[-1] = p - mem;
+          p[-1] = offset;
           /* p ≡ sa_alignment_max mod 2*sa_alignment_max.  */
           return p;
         }
diff --git a/lib/malloca.h b/lib/malloca.h
index 9cf7fbb52..dbbec3f06 100644
--- a/lib/malloca.h
+++ b/lib/malloca.h
@@ -2,18 +2,18 @@
    Copyright (C) 2003-2007, 2009-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2003.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _MALLOCA_H
 #define _MALLOCA_H
@@ -65,7 +65,6 @@ extern "C" {
 # define malloca(N) \
   mmalloca (N)
 #endif
-extern void * mmalloca (size_t n);
 
 /* Free a block of memory allocated through malloca().  */
 #if HAVE_ALLOCA
@@ -74,12 +73,16 @@ extern void freea (void *p);
 # define freea free
 #endif
 
+extern void *mmalloca (size_t n)
+  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC (freea, 1)
+  _GL_ATTRIBUTE_ALLOC_SIZE ((1));
+
 /* nmalloca(N,S) is an overflow-safe variant of malloca (N * S).
    It allocates an array of N objects, each with S bytes of memory,
-   on the stack.  S must be positive and N must be nonnegative.
-   Either N or S should be of type ptrdiff_t or size_t or wider.
+   on the stack.  N and S should be nonnegative and free of side effects.
    The array must be freed using freea() before the function returns.  */
-#define nmalloca(n, s) (xalloc_oversized (n, s) ? NULL : malloca ((n) * (s)))
+#define nmalloca(n, s) \
+  (xalloc_oversized (n, s) ? NULL : malloca ((n) * (size_t) (s)))
 
 
 #ifdef __cplusplus
diff --git a/lib/math.c b/lib/math.c
index ba2a6abd6..3ffd1d728 100644
--- a/lib/math.c
+++ b/lib/math.c
@@ -1,4 +1,22 @@
+/* Inline functions for <math.h>.
+
+   Copyright (C) 2012-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
 #include <config.h>
+
 #define _GL_MATH_INLINE _GL_EXTERN_INLINE
 #include "math.h"
 typedef int dummy;
diff --git a/lib/math.in.h b/lib/math.in.h
index d80047cd6..6a055fbf5 100644
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2002-2003, 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbrtowc-impl-utf8.h b/lib/mbrtowc-impl-utf8.h
index ea5ef1fe5..330fb1051 100644
--- a/lib/mbrtowc-impl-utf8.h
+++ b/lib/mbrtowc-impl-utf8.h
@@ -1,12 +1,12 @@
 /* Convert multibyte character to wide character.
    Copyright (C) 1999-2002, 2005-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbrtowc-impl.h b/lib/mbrtowc-impl.h
index f7e28fce9..bc3e68823 100644
--- a/lib/mbrtowc-impl.h
+++ b/lib/mbrtowc-impl.h
@@ -1,12 +1,12 @@
 /* Convert multibyte character to wide character.
    Copyright (C) 1999-2002, 2005-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbrtowc.c b/lib/mbrtowc.c
index 0db510470..8832f6e80 100644
--- a/lib/mbrtowc.c
+++ b/lib/mbrtowc.c
@@ -2,12 +2,12 @@
    Copyright (C) 1999-2002, 2005-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2008.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbsinit.c b/lib/mbsinit.c
index 7ca8df75c..f44015534 100644
--- a/lib/mbsinit.c
+++ b/lib/mbsinit.c
@@ -2,12 +2,12 @@
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2008.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbtowc-impl.h b/lib/mbtowc-impl.h
index 01342af50..30d715d6a 100644
--- a/lib/mbtowc-impl.h
+++ b/lib/mbtowc-impl.h
@@ -2,12 +2,12 @@
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2011.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbtowc-lock.c b/lib/mbtowc-lock.c
index ce7479363..0f7ae6c21 100644
--- a/lib/mbtowc-lock.c
+++ b/lib/mbtowc-lock.c
@@ -1,12 +1,12 @@
 /* Return the internal lock used by mbrtowc and mbrtoc32.
    Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbtowc-lock.h b/lib/mbtowc-lock.h
index 093951713..d31b0b6c7 100644
--- a/lib/mbtowc-lock.h
+++ b/lib/mbtowc-lock.h
@@ -1,12 +1,12 @@
 /* Use the internal lock used by mbrtowc and mbrtoc32.
    Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mbtowc.c b/lib/mbtowc.c
index 27111944c..47b431a42 100644
--- a/lib/mbtowc.c
+++ b/lib/mbtowc.c
@@ -2,12 +2,12 @@
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2011.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/memchr.c b/lib/memchr.c
index d8feb192f..56fd59d79 100644
--- a/lib/memchr.c
+++ b/lib/memchr.c
@@ -7,21 +7,21 @@
    adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu),
    and implemented by Roland McGrath (roland@ai.mit.edu).
 
-NOTE: The canonical source of this file is maintained with the GNU C Library.
-Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+   NOTE: The canonical source of this file is maintained with the GNU C 
Library.
+   Bugs can be reported to bug-glibc@prep.ai.mit.edu.
 
-This program is free software: you can redistribute it and/or modify it
-under the terms of the GNU Lesser General Public License as published by the
-Free Software Foundation; either version 3 of the License, or any
-later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU Lesser General Public License for more details.
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
-You should have received a copy of the GNU Lesser General Public License
-along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _LIBC
 # include <config.h>
diff --git a/lib/memchr.valgrind b/lib/memchr.valgrind
index 034d1ee76..4f16481ce 100644
--- a/lib/memchr.valgrind
+++ b/lib/memchr.valgrind
@@ -2,12 +2,12 @@
 
 # Copyright (C) 2009-2021 Free Software Foundation, Inc.
 #
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
+# This file is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2.1 of the
+# License, or (at your option) any later version.
 #
-# This program is distributed in the hope that it will be useful,
+# This file is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU Lesser General Public License for more details.
diff --git a/lib/mempcpy.c b/lib/mempcpy.c
index c80e119f7..cacacdbc6 100644
--- a/lib/mempcpy.c
+++ b/lib/mempcpy.c
@@ -1,18 +1,18 @@
 /* Copy memory area and return pointer after last written byte.
    Copyright (C) 2003, 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/minmax.h b/lib/minmax.h
index 7d0b67255..a03361baf 100644
--- a/lib/minmax.h
+++ b/lib/minmax.h
@@ -2,18 +2,18 @@
    Copyright (C) 1995, 1998, 2001, 2003, 2005, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _MINMAX_H
 #define _MINMAX_H
diff --git a/lib/mkdir.c b/lib/mkdir.c
index 453e428d3..2766cc786 100644
--- a/lib/mkdir.c
+++ b/lib/mkdir.c
@@ -3,12 +3,12 @@
 
    Copyright (C) 2001, 2003, 2006, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/mkostemp.c b/lib/mkostemp.c
index cfab63555..285f1badf 100644
--- a/lib/mkostemp.c
+++ b/lib/mkostemp.c
@@ -2,12 +2,12 @@
    Foundation, Inc.
    This file is derived from the one in the GNU C Library.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/msvc-inval.c b/lib/msvc-inval.c
index de6ebee3f..a23dac958 100644
--- a/lib/msvc-inval.c
+++ b/lib/msvc-inval.c
@@ -1,18 +1,18 @@
 /* Invalid parameter handler for MSVC runtime libraries.
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/msvc-inval.h b/lib/msvc-inval.h
index 0d418e1f1..e115a3514 100644
--- a/lib/msvc-inval.h
+++ b/lib/msvc-inval.h
@@ -1,18 +1,18 @@
 /* Invalid parameter handler for MSVC runtime libraries.
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _MSVC_INVAL_H
 #define _MSVC_INVAL_H
diff --git a/lib/msvc-nothrow.c b/lib/msvc-nothrow.c
index e72dabe0d..d3c1f54be 100644
--- a/lib/msvc-nothrow.c
+++ b/lib/msvc-nothrow.c
@@ -2,18 +2,18 @@
    with MSVC runtime libraries.
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/msvc-nothrow.h b/lib/msvc-nothrow.h
index a56cd4eaa..057b5dd8e 100644
--- a/lib/msvc-nothrow.h
+++ b/lib/msvc-nothrow.h
@@ -2,18 +2,18 @@
    with MSVC runtime libraries.
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _MSVC_NOTHROW_H
 #define _MSVC_NOTHROW_H
diff --git a/lib/netdb.in.h b/lib/netdb.in.h
index 6bcaf1a22..eb5c960ba 100644
--- a/lib/netdb.in.h
+++ b/lib/netdb.in.h
@@ -2,18 +2,18 @@
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
    Written by Simon Josefsson.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* This file is supposed to be used on platforms that lack <netdb.h>.
    It is intended to provide definitions and prototypes needed by an
diff --git a/lib/netinet_in.in.h b/lib/netinet_in.in.h
index 3c1cad68e..21f3a64f9 100644
--- a/lib/netinet_in.in.h
+++ b/lib/netinet_in.in.h
@@ -1,18 +1,18 @@
 /* Substitute for <netinet/in.h>.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _@GUARD_PREFIX@_NETINET_IN_H
 
diff --git a/lib/nl_langinfo-lock.c b/lib/nl_langinfo-lock.c
index 915c38bc7..fcdf56dc6 100644
--- a/lib/nl_langinfo-lock.c
+++ b/lib/nl_langinfo-lock.c
@@ -1,12 +1,12 @@
 /* Return the internal lock used by nl_langinfo.
    Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/nl_langinfo.c b/lib/nl_langinfo.c
index e8f3cef46..b481f209d 100644
--- a/lib/nl_langinfo.c
+++ b/lib/nl_langinfo.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/nproc.c b/lib/nproc.c
index fef1f8b20..e3ddb9288 100644
--- a/lib/nproc.c
+++ b/lib/nproc.c
@@ -2,18 +2,18 @@
 
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Glen Lenker and Bruno Haible.  */
 
diff --git a/lib/nproc.h b/lib/nproc.h
index cd3ed365d..d7659a5ca 100644
--- a/lib/nproc.h
+++ b/lib/nproc.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Glen Lenker and Bruno Haible.  */
 
diff --git a/lib/nstrftime.c b/lib/nstrftime.c
index 7ef75290b..7f258e872 100644
--- a/lib/nstrftime.c
+++ b/lib/nstrftime.c
@@ -1,19 +1,18 @@
 /* Copyright (C) 1991-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   The GNU C Library is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifdef _LIBC
 # define USE_IN_EXTENDED_LOCALE_MODEL 1
diff --git a/lib/open.c b/lib/open.c
index 5dc117eeb..372cda881 100644
--- a/lib/open.c
+++ b/lib/open.c
@@ -1,12 +1,12 @@
 /* Open a descriptor to a file.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/pathmax.h b/lib/pathmax.h
index 4af7802fd..716f4a9aa 100644
--- a/lib/pathmax.h
+++ b/lib/pathmax.h
@@ -2,18 +2,18 @@
    Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _PATHMAX_H
 # define _PATHMAX_H
diff --git a/lib/pipe.c b/lib/pipe.c
index 3316cebd0..fc978f2eb 100644
--- a/lib/pipe.c
+++ b/lib/pipe.c
@@ -1,18 +1,18 @@
 /* Create a pipe.
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/pipe2.c b/lib/pipe2.c
index 25bce6ff4..9ba8c3b70 100644
--- a/lib/pipe2.c
+++ b/lib/pipe2.c
@@ -1,18 +1,18 @@
 /* Create a pipe, with specific opening flags.
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/poll.c b/lib/poll.c
index d7876760c..8d5ba9655 100644
--- a/lib/poll.c
+++ b/lib/poll.c
@@ -5,18 +5,18 @@
 
    This file is part of gnulib.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Tell gcc not to warn about the (nfd < 0) tests, below.  */
 #if (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) || 4 < __GNUC__
diff --git a/lib/poll.in.h b/lib/poll.in.h
index 1fe83706f..e94cd31de 100644
--- a/lib/poll.in.h
+++ b/lib/poll.in.h
@@ -5,18 +5,18 @@
 
    This file is part of gnulib.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _@GUARD_PREFIX@_POLL_H
 
diff --git a/lib/printf-args.c b/lib/printf-args.c
index 22e44ef16..b822682c3 100644
--- a/lib/printf-args.c
+++ b/lib/printf-args.c
@@ -2,18 +2,18 @@
    Copyright (C) 1999, 2002-2003, 2005-2007, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* This file can be parametrized with the following macros:
      ENABLE_UNISTDIO    Set to 1 to enable the unistdio extensions.
diff --git a/lib/printf-args.h b/lib/printf-args.h
index d15b12d1f..c8d91747b 100644
--- a/lib/printf-args.h
+++ b/lib/printf-args.h
@@ -2,18 +2,18 @@
    Copyright (C) 1999, 2002-2003, 2006-2007, 2011-2021 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _PRINTF_ARGS_H
 #define _PRINTF_ARGS_H
diff --git a/lib/printf-parse.c b/lib/printf-parse.c
index 9f9799528..f21cc17c0 100644
--- a/lib/printf-parse.c
+++ b/lib/printf-parse.c
@@ -1,18 +1,18 @@
 /* Formatted output to strings.
    Copyright (C) 1999-2000, 2002-2003, 2006-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* This file can be parametrized with the following macros:
      CHAR_T             The element type of the format string.
@@ -48,16 +48,7 @@
 #include <stddef.h>
 
 /* Get intmax_t.  */
-#if defined IN_LIBINTL || defined IN_LIBASPRINTF
-# if HAVE_STDINT_H_WITH_UINTMAX
-#  include <stdint.h>
-# endif
-# if HAVE_INTTYPES_H_WITH_UINTMAX
-#  include <inttypes.h>
-# endif
-#else
-# include <stdint.h>
-#endif
+#include <stdint.h>
 
 /* malloc(), realloc(), free().  */
 #include <stdlib.h>
diff --git a/lib/printf-parse.h b/lib/printf-parse.h
index e05ac8f59..77b74093c 100644
--- a/lib/printf-parse.h
+++ b/lib/printf-parse.h
@@ -2,18 +2,18 @@
    Copyright (C) 1999, 2002-2003, 2005, 2007, 2010-2021 Free Software
    Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _PRINTF_PARSE_H
 #define _PRINTF_PARSE_H
diff --git a/lib/putenv.c b/lib/putenv.c
index d342b8153..435d10fdc 100644
--- a/lib/putenv.c
+++ b/lib/putenv.c
@@ -4,12 +4,12 @@
    NOTE: The canonical source of this file is maintained with the GNU C
    Library.  Bugs can be reported to bug-glibc@prep.ai.mit.edu.
 
-   This program is free software: you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published by the
-   Free Software Foundation; either version 3 of the License, or any
-   later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/raise.c b/lib/raise.c
index eda9126b7..37c100dd8 100644
--- a/lib/raise.c
+++ b/lib/raise.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2002-2003, 2005-2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/rawmemchr.c b/lib/rawmemchr.c
index ef356895e..896d435af 100644
--- a/lib/rawmemchr.c
+++ b/lib/rawmemchr.c
@@ -1,12 +1,12 @@
 /* Searching in a string.
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/rawmemchr.valgrind b/lib/rawmemchr.valgrind
index 90ed95e1d..d489c320c 100644
--- a/lib/rawmemchr.valgrind
+++ b/lib/rawmemchr.valgrind
@@ -2,12 +2,12 @@
 
 # Copyright (C) 2008-2021 Free Software Foundation, Inc.
 #
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
+# This file is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2.1 of the
+# License, or (at your option) any later version.
 #
-# This program is distributed in the hope that it will be useful,
+# This file is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU Lesser General Public License for more details.
diff --git a/lib/read.c b/lib/read.c
index 125e73874..840d9ed5a 100644
--- a/lib/read.c
+++ b/lib/read.c
@@ -2,12 +2,12 @@
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2011.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/readlink.c b/lib/readlink.c
index 38d9e0c6b..d4f4b08e9 100644
--- a/lib/readlink.c
+++ b/lib/readlink.c
@@ -1,12 +1,12 @@
 /* Read the contents of a symbolic link.
    Copyright (C) 2003-2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/realloc.c b/lib/realloc.c
index 114551498..af03f0c57 100644
--- a/lib/realloc.c
+++ b/lib/realloc.c
@@ -3,12 +3,12 @@
    Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
@@ -18,68 +18,46 @@
 
 /* written by Jim Meyering and Bruno Haible */
 
-#define _GL_USE_STDLIB_ALLOC 1
 #include <config.h>
 
-/* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h.  */
-#ifdef realloc
-# define NEED_REALLOC_GNU 1
-/* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU.  */
-#elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU
-# define NEED_REALLOC_GNU 1
-#endif
-
-/* Infer the properties of the system's malloc function.
-   The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU.  */
-#if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU
-# define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1
-#endif
-
 #include <stdlib.h>
 
-/* A function definition is only needed if NEED_REALLOC_GNU is defined above
-   or if the module 'realloc-posix' requests it.  */
-#if NEED_REALLOC_GNU || (GNULIB_REALLOC_POSIX && !HAVE_REALLOC_POSIX)
+#include <errno.h>
+
+#include "xalloc-oversized.h"
 
-# include <errno.h>
+/* Call the system's realloc below.  This file does not define
+   _GL_USE_STDLIB_ALLOC because it needs Gnulib's malloc if present.  */
+#undef realloc
 
 /* Change the size of an allocated block of memory P to N bytes,
-   with error checking.  If N is zero, change it to 1.  If P is NULL,
-   use malloc.  */
+   with error checking.  If P is NULL, use malloc.  Otherwise if N is zero,
+   free P and return NULL.  */
 
 void *
 rpl_realloc (void *p, size_t n)
 {
-  void *result;
+  if (p == NULL)
+    return malloc (n);
 
-# if NEED_REALLOC_GNU
   if (n == 0)
     {
-      n = 1;
-
-      /* In theory realloc might fail, so don't rely on it to free.  */
       free (p);
-      p = NULL;
+      return NULL;
     }
-# endif
 
-  if (p == NULL)
+  if (xalloc_oversized (n, 1))
     {
-# if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
-      if (n == 0)
-        n = 1;
-# endif
-      result = malloc (n);
+      errno = ENOMEM;
+      return NULL;
     }
-  else
-    result = realloc (p, n);
 
-# if !HAVE_REALLOC_POSIX
+  void *result = realloc (p, n);
+
+#if !HAVE_MALLOC_POSIX
   if (result == NULL)
     errno = ENOMEM;
-# endif
+#endif
 
   return result;
 }
-
-#endif
diff --git a/lib/recv.c b/lib/recv.c
index f2a342f7d..3eb2b4d4b 100644
--- a/lib/recv.c
+++ b/lib/recv.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/recvfrom.c b/lib/recvfrom.c
index 8abda0c69..25231ffe1 100644
--- a/lib/recvfrom.c
+++ b/lib/recvfrom.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/regex_internal.c b/lib/regex_internal.c
index 55f6b66de..aefcfa2f5 100644
--- a/lib/regex_internal.c
+++ b/lib/regex_internal.c
@@ -1211,6 +1211,10 @@ re_node_set_merge (re_node_set *dest, const re_node_set 
*src)
 
   if (__glibc_unlikely (dest->nelem == 0))
     {
+      /* Although we already guaranteed above that dest->alloc != 0 and
+         therefore dest->elems != NULL, add a debug assertion to pacify
+         GCC 11.2.1's -fanalyzer.  */
+      DEBUG_ASSERT (dest->elems);
       dest->nelem = src->nelem;
       memcpy (dest->elems, src->elems, src->nelem * sizeof (Idx));
       return REG_NOERROR;
@@ -1286,7 +1290,10 @@ re_node_set_insert (re_node_set *set, Idx elem)
 
   if (__glibc_unlikely (set->nelem) == 0)
     {
-      /* We already guaranteed above that set->alloc != 0.  */
+      /* Although we already guaranteed above that set->alloc != 0 and
+         therefore set->elems != NULL, add a debug assertion to pacify
+         GCC 11.2 -fanalyzer.  */
+      DEBUG_ASSERT (set->elems);
       set->elems[0] = elem;
       ++set->nelem;
       return true;
diff --git a/lib/regexec.c b/lib/regexec.c
index 6309deac8..5e4eb497a 100644
--- a/lib/regexec.c
+++ b/lib/regexec.c
@@ -1220,9 +1220,13 @@ proceed_next_node (const re_match_context_t *mctx, Idx 
nregs, regmatch_t *regs,
     {
       re_node_set *cur_nodes = &mctx->state_log[*pidx]->nodes;
       re_node_set *edests = &dfa->edests[node];
-      bool ok = re_node_set_insert (eps_via_nodes, node);
-      if (__glibc_unlikely (! ok))
-       return -2;
+
+      if (! re_node_set_contains (eps_via_nodes, node))
+        {
+          bool ok = re_node_set_insert (eps_via_nodes, node);
+          if (__glibc_unlikely (! ok))
+            return -2;
+        }
 
       /* Pick a valid destination, or return -1 if none is found.  */
       Idx dest_node = -1;
@@ -1414,7 +1418,7 @@ set_regs (const regex_t *preg, const re_match_context_t 
*mctx, size_t nmatch,
       update_regs (dfa, pmatch, prev_idx_match, cur_node, idx, nmatch);
 
       if ((idx == pmatch[0].rm_eo && cur_node == mctx->last_node)
-         || re_node_set_contains (&eps_via_nodes, cur_node))
+         || (fs && re_node_set_contains (&eps_via_nodes, cur_node)))
        {
          Idx reg_idx;
          cur_node = -1;
diff --git a/lib/rename.c b/lib/rename.c
index 487302543..a3b7dc641 100644
--- a/lib/rename.c
+++ b/lib/rename.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2001-2003, 2005-2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/rmdir.c b/lib/rmdir.c
index a99fb1ee7..6295e4125 100644
--- a/lib/rmdir.c
+++ b/lib/rmdir.c
@@ -3,12 +3,12 @@
    Copyright (C) 1988, 1990, 1999, 2003-2006, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/round.c b/lib/round.c
index 47a393658..552505042 100644
--- a/lib/round.c
+++ b/lib/round.c
@@ -1,18 +1,18 @@
 /* Round toward nearest, breaking ties away from zero.
    Copyright (C) 2007, 2010-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Ben Pfaff <blp@gnu.org>, 2007.
    Based heavily on code by Bruno Haible. */
diff --git a/lib/safe-read.c b/lib/safe-read.c
index a4a1b089d..e187b1258 100644
--- a/lib/safe-read.c
+++ b/lib/safe-read.c
@@ -3,12 +3,12 @@
    Copyright (C) 1993-1994, 1998, 2002-2006, 2009-2021 Free Software
    Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/safe-read.h b/lib/safe-read.h
index 50501245f..111aff5c4 100644
--- a/lib/safe-read.h
+++ b/lib/safe-read.h
@@ -1,12 +1,12 @@
 /* An interface to read() that retries after interrupts.
    Copyright (C) 2002, 2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/safe-write.c b/lib/safe-write.c
index f8b3b8b2d..494de1495 100644
--- a/lib/safe-write.c
+++ b/lib/safe-write.c
@@ -1,12 +1,12 @@
 /* An interface to write that retries after interrupts.
    Copyright (C) 2002, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/safe-write.h b/lib/safe-write.h
index 459629e1a..25d8c710c 100644
--- a/lib/safe-write.h
+++ b/lib/safe-write.h
@@ -1,12 +1,12 @@
 /* An interface to write() that retries after interrupts.
    Copyright (C) 2002, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/same-inode.h b/lib/same-inode.h
index 45e322a84..c7277779a 100644
--- a/lib/same-inode.h
+++ b/lib/same-inode.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/scratch_buffer.h b/lib/scratch_buffer.h
index 4b17f72ea..88735771d 100644
--- a/lib/scratch_buffer.h
+++ b/lib/scratch_buffer.h
@@ -1,12 +1,12 @@
 /* Variable-sized buffer with on-stack default allocation.
    Copyright (C) 2017-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
@@ -110,14 +110,18 @@ extern void *scratch_buffer_dupfree (struct 
scratch_buffer *buffer,
 
 /* The implementation is imported from glibc.  */
 
-#include <libc-config.h>
-
 /* Avoid possible conflicts with symbols exported by the GNU libc.  */
 #define __libc_scratch_buffer_dupfree gl_scratch_buffer_dupfree
 #define __libc_scratch_buffer_grow gl_scratch_buffer_grow
 #define __libc_scratch_buffer_grow_preserve gl_scratch_buffer_grow_preserve
 #define __libc_scratch_buffer_set_array_size gl_scratch_buffer_set_array_size
 
-#include <malloc/scratch_buffer.h>
+#ifndef _GL_LIKELY
+/* Rely on __builtin_expect, as provided by the module 'builtin-expect'.  */
+# define _GL_LIKELY(cond) __builtin_expect ((cond), 1)
+# define _GL_UNLIKELY(cond) __builtin_expect ((cond), 0)
+#endif
+
+#include <malloc/scratch_buffer.gl.h>
 
 #endif /* _GL_SCRATCH_BUFFER_H */
diff --git a/lib/select.c b/lib/select.c
index 9a6fc2804..eddac4b61 100644
--- a/lib/select.c
+++ b/lib/select.c
@@ -5,18 +5,18 @@
 
    This file is part of gnulib.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
@@ -530,12 +530,13 @@ restart:
       if (h != handle_array[nhandles])
         {
           /* Perform handle->descriptor mapping.  */
-          WSAEventSelect ((SOCKET) h, NULL, 0);
-          if (FD_ISSET (h, &handle_rfds))
+          SOCKET s = (SOCKET) h;
+          WSAEventSelect (s, NULL, 0);
+          if (FD_ISSET (s, &handle_rfds))
             FD_SET (i, rfds);
-          if (FD_ISSET (h, &handle_wfds))
+          if (FD_ISSET (s, &handle_wfds))
             FD_SET (i, wfds);
-          if (FD_ISSET (h, &handle_xfds))
+          if (FD_ISSET (s, &handle_xfds))
             FD_SET (i, xfds);
         }
       else
diff --git a/lib/send.c b/lib/send.c
index 36258642d..58cb70b56 100644
--- a/lib/send.c
+++ b/lib/send.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/sendto.c b/lib/sendto.c
index 5372a6683..029ccd69f 100644
--- a/lib/sendto.c
+++ b/lib/sendto.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/setenv.c b/lib/setenv.c
index 53740447a..3ad3477e9 100644
--- a/lib/setenv.c
+++ b/lib/setenv.c
@@ -1,12 +1,12 @@
 /* Copyright (C) 1992, 1995-2003, 2005-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/setlocale-lock.c b/lib/setlocale-lock.c
index 3cb5d4788..53e231c6c 100644
--- a/lib/setlocale-lock.c
+++ b/lib/setlocale-lock.c
@@ -1,12 +1,12 @@
 /* Return the internal lock used by setlocale_null_r.
    Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/setlocale_null.c b/lib/setlocale_null.c
index 4c50472f0..dbfda25c5 100644
--- a/lib/setlocale_null.c
+++ b/lib/setlocale_null.c
@@ -1,12 +1,12 @@
 /* Query the name of the current global locale.
    Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/setlocale_null.h b/lib/setlocale_null.h
index bf96fa490..00c42e2aa 100644
--- a/lib/setlocale_null.h
+++ b/lib/setlocale_null.h
@@ -1,12 +1,12 @@
 /* Query the name of the current global locale.
    Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/setsockopt.c b/lib/setsockopt.c
index db32996f0..10b1e9061 100644
--- a/lib/setsockopt.c
+++ b/lib/setsockopt.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/shutdown.c b/lib/shutdown.c
index c5527cd86..70c927c6a 100644
--- a/lib/shutdown.c
+++ b/lib/shutdown.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/signal.in.h b/lib/signal.in.h
index b2111372d..275da8c81 100644
--- a/lib/signal.in.h
+++ b/lib/signal.in.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2006-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/signbitd.c b/lib/signbitd.c
index 2992dd47b..22597719f 100644
--- a/lib/signbitd.c
+++ b/lib/signbitd.c
@@ -1,12 +1,12 @@
 /* signbit() macro: Determine the sign bit of a floating-point number.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/signbitf.c b/lib/signbitf.c
index 01be49a32..b196d9ab5 100644
--- a/lib/signbitf.c
+++ b/lib/signbitf.c
@@ -1,12 +1,12 @@
 /* signbit() macro: Determine the sign bit of a floating-point number.
    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/signbitl.c b/lib/signbitl.c
index 6e0f64e9b..f73802d1a 100644
--- a/lib/signbitl.c
+++ b/lib/signbitl.c
@@ -1,12 +1,12 @@
 /* signbit() macro: Determine the sign bit of a floating-point number.
    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/size_max.h b/lib/size_max.h
index c6d4a1835..1186ba95d 100644
--- a/lib/size_max.h
+++ b/lib/size_max.h
@@ -2,18 +2,18 @@
    Copyright (C) 2005-2006, 2009-2021 Free Software Foundation, Inc.
    Written by Simon Josefsson.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef GNULIB_SIZE_MAX_H
 #define GNULIB_SIZE_MAX_H
diff --git a/lib/snprintf.c b/lib/snprintf.c
index 357f287f2..a589cf1a6 100644
--- a/lib/snprintf.c
+++ b/lib/snprintf.c
@@ -2,18 +2,18 @@
    Copyright (C) 2004, 2006-2021 Free Software Foundation, Inc.
    Written by Simon Josefsson and Paul Eggert.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
diff --git a/lib/socket.c b/lib/socket.c
index 85252603d..0f2e6ff91 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/sockets.c b/lib/sockets.c
index 394b01ee5..934da73d2 100644
--- a/lib/sockets.c
+++ b/lib/sockets.c
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/sockets.h b/lib/sockets.h
index a13b0cb7a..e70c2bbfd 100644
--- a/lib/sockets.h
+++ b/lib/sockets.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/stat-time.c b/lib/stat-time.c
index 81b83ddb4..7b9279269 100644
--- a/lib/stat-time.c
+++ b/lib/stat-time.c
@@ -1,3 +1,21 @@
+/* stat-related time functions.
+
+   Copyright (C) 2012-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
 #include <config.h>
+
 #define _GL_STAT_TIME_INLINE _GL_EXTERN_INLINE
 #include "stat-time.h"
diff --git a/lib/stat-time.h b/lib/stat-time.h
index 00c93296b..fe3483d63 100644
--- a/lib/stat-time.h
+++ b/lib/stat-time.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2005, 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/stat-w32.c b/lib/stat-w32.c
index fe505cbdb..4164199b6 100644
--- a/lib/stat-w32.c
+++ b/lib/stat-w32.c
@@ -1,12 +1,12 @@
 /* Core of implementation of fstat and stat for native Windows.
    Copyright (C) 2017-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/stat-w32.h b/lib/stat-w32.h
index 05c9b0ff5..5b56c09dd 100644
--- a/lib/stat-w32.h
+++ b/lib/stat-w32.h
@@ -1,12 +1,12 @@
 /* Core of implementation of fstat and stat for native Windows.
    Copyright (C) 2017-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/stat.c b/lib/stat.c
index 39a12691f..bc9a767d3 100644
--- a/lib/stat.c
+++ b/lib/stat.c
@@ -1,12 +1,12 @@
 /* Work around platform bugs in stat.
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/stdalign.in.h b/lib/stdalign.in.h
index 7b51043ec..592d58e37 100644
--- a/lib/stdalign.in.h
+++ b/lib/stdalign.in.h
@@ -2,18 +2,18 @@
 
    Copyright 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert and Bruno Haible.  */
 
diff --git a/lib/stdbool.in.h b/lib/stdbool.in.h
index c404f8d13..2a1992da8 100644
--- a/lib/stdbool.in.h
+++ b/lib/stdbool.in.h
@@ -1,18 +1,18 @@
 /* Copyright (C) 2001-2003, 2006-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <haible@clisp.cons.org>, 2001.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _GL_STDBOOL_H
 #define _GL_STDBOOL_H
diff --git a/lib/stddef.in.h b/lib/stddef.in.h
index 4c53e6455..42290d448 100644
--- a/lib/stddef.in.h
+++ b/lib/stddef.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Eric Blake.  */
 
diff --git a/lib/stdint.in.h b/lib/stdint.in.h
index a98f1c8cf..85c5418f1 100644
--- a/lib/stdint.in.h
+++ b/lib/stdint.in.h
@@ -2,18 +2,18 @@
    Written by Paul Eggert, Bruno Haible, Sam Steingold, Peter Burwood.
    This file is part of gnulib.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /*
  * ISO C 99 <stdint.h> for platforms that lack it.
@@ -85,7 +85,7 @@
 
 /* Override WINT_MIN and WINT_MAX if gnulib's <wchar.h> or <wctype.h> overrides
    wint_t.  */
-#if @GNULIB_OVERRIDES_WINT_T@
+#if @GNULIBHEADERS_OVERRIDE_WINT_T@
 # undef WINT_MIN
 # undef WINT_MAX
 # define WINT_MIN 0x0U
@@ -598,7 +598,7 @@ typedef int _verify_intmax_size[sizeof (intmax_t) == sizeof 
(uintmax_t)
 /* wint_t limits */
 /* If gnulib's <wchar.h> or <wctype.h> overrides wint_t, @WINT_T_SUFFIX@ is not
    accurate, therefore use the definitions from above.  */
-# if !@GNULIB_OVERRIDES_WINT_T@
+# if !@GNULIBHEADERS_OVERRIDE_WINT_T@
 #  undef WINT_MIN
 #  undef WINT_MAX
 #  if @HAVE_SIGNED_WINT_T@
diff --git a/lib/stdio.in.h b/lib/stdio.in.h
index 6e10c742e..20ba488a4 100644
--- a/lib/stdio.in.h
+++ b/lib/stdio.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2004, 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
@@ -242,7 +242,7 @@ _GL_WARN_ON_USE (fclose, "fclose is not always POSIX 
compliant - "
 _GL_CXXALIAS_MDA (fcloseall, int, (void));
 # else
 #  if @HAVE_DECL_FCLOSEALL@
-#   if defined __FreeBSD__
+#   if defined __FreeBSD__ || defined __DragonFly__
 _GL_CXXALIAS_SYS (fcloseall, void, (void));
 #   else
 _GL_CXXALIAS_SYS (fcloseall, int, (void));
@@ -1257,6 +1257,7 @@ _GL_CXXALIASWARN (scanf);
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   define snprintf rpl_snprintf
 #  endif
+#  define GNULIB_overrides_snprintf 1
 _GL_FUNCDECL_RPL (snprintf, int,
                   (char *restrict str, size_t size,
                    const char *restrict format, ...)
@@ -1302,6 +1303,7 @@ _GL_WARN_ON_USE (snprintf, "snprintf is unportable - "
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   define sprintf rpl_sprintf
 #  endif
+#  define GNULIB_overrides_sprintf 1
 _GL_FUNCDECL_RPL (sprintf, int,
                   (char *restrict str, const char *restrict format, ...)
                   _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD (2, 3)
@@ -1369,6 +1371,7 @@ _GL_WARN_ON_USE (tmpfile, "tmpfile is not usable on mingw 
- "
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   define asprintf rpl_asprintf
 #  endif
+#  define GNULIB_overrides_asprintf
 _GL_FUNCDECL_RPL (asprintf, int,
                   (char **result, const char *format, ...)
                   _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD (2, 3)
@@ -1390,6 +1393,7 @@ _GL_CXXALIASWARN (asprintf);
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   define vasprintf rpl_vasprintf
 #  endif
+#  define GNULIB_overrides_vasprintf 1
 _GL_FUNCDECL_RPL (vasprintf, int,
                   (char **result, const char *format, va_list args)
                   _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD (2, 0)
@@ -1573,6 +1577,7 @@ _GL_CXXALIASWARN (vscanf);
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   define vsnprintf rpl_vsnprintf
 #  endif
+#  define GNULIB_overrides_vsnprintf 1
 _GL_FUNCDECL_RPL (vsnprintf, int,
                   (char *restrict str, size_t size,
                    const char *restrict format, va_list args)
@@ -1609,6 +1614,7 @@ _GL_WARN_ON_USE (vsnprintf, "vsnprintf is unportable - "
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   define vsprintf rpl_vsprintf
 #  endif
+#  define GNULIB_overrides_vsprintf 1
 _GL_FUNCDECL_RPL (vsprintf, int,
                   (char *restrict str,
                    const char *restrict format, va_list args)
diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index 7e012621d..652062d94 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 1995, 2001-2004, 2006-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
@@ -1032,12 +1032,23 @@ _GL_WARN_ON_USE (realloc, "realloc is not POSIX 
compliant everywhere - "
 
 
 #if @GNULIB_REALLOCARRAY@
-# if ! @HAVE_REALLOCARRAY@
+# if @REPLACE_REALLOCARRAY@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef reallocarray
+#   define reallocarray rpl_reallocarray
+#  endif
+_GL_FUNCDECL_RPL (reallocarray, void *,
+                  (void *ptr, size_t nmemb, size_t size));
+_GL_CXXALIAS_RPL (reallocarray, void *,
+                  (void *ptr, size_t nmemb, size_t size));
+# else
+#  if ! @HAVE_REALLOCARRAY@
 _GL_FUNCDECL_SYS (reallocarray, void *,
                   (void *ptr, size_t nmemb, size_t size));
-# endif
+#  endif
 _GL_CXXALIAS_SYS (reallocarray, void *,
                   (void *ptr, size_t nmemb, size_t size));
+# endif
 _GL_CXXALIASWARN (reallocarray);
 #elif defined GNULIB_POSIXCHECK
 # undef reallocarray
diff --git a/lib/strdup.c b/lib/strdup.c
index 2a3704900..e5d4d75c8 100644
--- a/lib/strdup.c
+++ b/lib/strdup.c
@@ -3,18 +3,18 @@
 
    This file is part of the GNU C Library.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _LIBC
 # include <config.h>
diff --git a/lib/streq.h b/lib/streq.h
index 2d9d4c2c6..adabd158e 100644
--- a/lib/streq.h
+++ b/lib/streq.h
@@ -1,15 +1,15 @@
 /* Optimized string comparison.
    Copyright (C) 2001-2002, 2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
diff --git a/lib/strftime.h b/lib/strftime.h
index 645e8c768..790a80ed8 100644
--- a/lib/strftime.h
+++ b/lib/strftime.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2002, 2004, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/striconveh.c b/lib/striconveh.c
index 82f6467ba..78a5e0296 100644
--- a/lib/striconveh.c
+++ b/lib/striconveh.c
@@ -2,12 +2,12 @@
    Copyright (C) 2001-2021 Free Software Foundation, Inc.
    Written by Bruno Haible and Simon Josefsson.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/striconveh.h b/lib/striconveh.h
index c9dff1e69..bd8e0fea0 100644
--- a/lib/striconveh.h
+++ b/lib/striconveh.h
@@ -2,12 +2,12 @@
    Copyright (C) 2001-2007, 2009-2021 Free Software Foundation, Inc.
    Written by Bruno Haible and Simon Josefsson.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/string.in.h b/lib/string.in.h
index 1292e29a7..cb964bc8d 100644
--- a/lib/string.in.h
+++ b/lib/string.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 1995-1996, 2001-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
@@ -446,7 +446,7 @@ _GL_WARN_ON_USE (strdup, "strdup is unportable - "
 #elif @GNULIB_MDA_STRDUP@
 /* On native Windows, map 'creat' to '_creat', so that -loldnames is not
    required.  In C++ with GNULIB_NAMESPACE, avoid differences between
-   platforms by defining GNULIB_NAMESPACE::creat always.  */
+   platforms by defining GNULIB_NAMESPACE::strdup always.  */
 # if defined _WIN32 && !defined __CYGWIN__
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   undef strdup
diff --git a/lib/stripslash.c b/lib/stripslash.c
index b0797959f..99bfbe66b 100644
--- a/lib/stripslash.c
+++ b/lib/stripslash.c
@@ -3,12 +3,12 @@
    Copyright (C) 1990, 2001, 2003-2006, 2009-2021 Free Software Foundation,
    Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/sys-limits.h b/lib/sys-limits.h
index 1856e7f82..2d9784d1b 100644
--- a/lib/sys-limits.h
+++ b/lib/sys-limits.h
@@ -2,18 +2,18 @@
 
    Copyright 2018-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _GL_SYS_LIMITS_H
 #define _GL_SYS_LIMITS_H
diff --git a/lib/sys_file.in.h b/lib/sys_file.in.h
index e18594fda..41660822b 100644
--- a/lib/sys_file.in.h
+++ b/lib/sys_file.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Richard W.M. Jones.  */
 
diff --git a/lib/sys_random.in.h b/lib/sys_random.in.h
index 1a479e967..1abd6c544 100644
--- a/lib/sys_random.in.h
+++ b/lib/sys_random.in.h
@@ -1,18 +1,18 @@
 /* Substitute for <sys/random.h>.
    Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 # if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
diff --git a/lib/sys_select.in.h b/lib/sys_select.in.h
index d82c5d18a..f8ef648d4 100644
--- a/lib/sys_select.in.h
+++ b/lib/sys_select.in.h
@@ -1,18 +1,18 @@
 /* Substitute for <sys/select.h>.
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 # if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
diff --git a/lib/sys_socket.c b/lib/sys_socket.c
index 3b261da03..d90b32c97 100644
--- a/lib/sys_socket.c
+++ b/lib/sys_socket.c
@@ -1,4 +1,22 @@
+/* Inline functions for <sys/socket.h>.
+
+   Copyright (C) 2012-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
 #include <config.h>
+
 #define _GL_SYS_SOCKET_INLINE _GL_EXTERN_INLINE
 #include "sys/socket.h"
 typedef int dummy;
diff --git a/lib/sys_socket.in.h b/lib/sys_socket.in.h
index c0baa71c0..0a2c57db5 100644
--- a/lib/sys_socket.in.h
+++ b/lib/sys_socket.in.h
@@ -3,18 +3,18 @@
    Copyright (C) 2005-2021 Free Software Foundation, Inc.
    Written by Simon Josefsson.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* This file is supposed to be used on platforms that lack <sys/socket.h>,
    on platforms where <sys/socket.h> cannot be included standalone, and on
diff --git a/lib/sys_stat.in.h b/lib/sys_stat.in.h
index 125aca0d3..babe3dba3 100644
--- a/lib/sys_stat.in.h
+++ b/lib/sys_stat.in.h
@@ -1,18 +1,18 @@
 /* Provide a more complete sys/stat.h header file.
    Copyright (C) 2005-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Eric Blake, Paul Eggert, and Jim Meyering.  */
 
diff --git a/lib/sys_time.in.h b/lib/sys_time.in.h
index f310ca5e8..8035fbe7e 100644
--- a/lib/sys_time.in.h
+++ b/lib/sys_time.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert.  */
 
diff --git a/lib/sys_times.in.h b/lib/sys_times.in.h
index 3d96200a7..85b728f00 100644
--- a/lib/sys_times.in.h
+++ b/lib/sys_times.in.h
@@ -1,18 +1,18 @@
 /* Provide a sys/times.h header file.
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Simon Josefsson <simon@josefsson.org>, 2008.  */
 
diff --git a/lib/sys_types.in.h b/lib/sys_types.in.h
index 26e7db73f..2079d72ef 100644
--- a/lib/sys_types.in.h
+++ b/lib/sys_types.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
diff --git a/lib/sys_uio.in.h b/lib/sys_uio.in.h
index 1941360cc..507ab011b 100644
--- a/lib/sys_uio.in.h
+++ b/lib/sys_uio.in.h
@@ -1,18 +1,18 @@
 /* Substitute for <sys/uio.h>.
    Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 # if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
diff --git a/lib/tempname.h b/lib/tempname.h
index c91a58d83..795bb4976 100644
--- a/lib/tempname.h
+++ b/lib/tempname.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/time-internal.h b/lib/time-internal.h
index b86b7a012..6bbd0a727 100644
--- a/lib/time-internal.h
+++ b/lib/time-internal.h
@@ -2,18 +2,18 @@
 
    Copyright 2015-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert.  */
 
diff --git a/lib/time.in.h b/lib/time.in.h
index cbd2bbaf7..a73fe59cb 100644
--- a/lib/time.in.h
+++ b/lib/time.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
diff --git a/lib/time_r.c b/lib/time_r.c
index 2510c4eb2..88d3c1c76 100644
--- a/lib/time_r.c
+++ b/lib/time_r.c
@@ -2,18 +2,18 @@
 
    Copyright (C) 2003, 2006-2007, 2010-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert.  */
 
diff --git a/lib/time_rz.c b/lib/time_rz.c
index d32cce796..e7722447c 100644
--- a/lib/time_rz.c
+++ b/lib/time_rz.c
@@ -2,18 +2,18 @@
 
    Copyright 2015-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert.  */
 
diff --git a/lib/times.c b/lib/times.c
index b8afa6092..72b852e58 100644
--- a/lib/times.c
+++ b/lib/times.c
@@ -2,18 +2,18 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Simon Josefsson <simon@josefsson.org>, 2008.  */
 
diff --git a/lib/trunc.c b/lib/trunc.c
index cf2adac4b..1c9c420af 100644
--- a/lib/trunc.c
+++ b/lib/trunc.c
@@ -1,12 +1,12 @@
 /* Round towards zero.
    Copyright (C) 2007, 2010-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/tzset.c b/lib/tzset.c
index 1f423c474..7fd4936b2 100644
--- a/lib/tzset.c
+++ b/lib/tzset.c
@@ -2,18 +2,18 @@
 
    Copyright (C) 2001-2003, 2005-2007, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* written by Jim Meyering */
 
diff --git a/lib/unistd.c b/lib/unistd.c
index 72bad1c05..076345602 100644
--- a/lib/unistd.c
+++ b/lib/unistd.c
@@ -1,4 +1,22 @@
+/* Inline functions for <unistd.h>.
+
+   Copyright (C) 2012-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
 #include <config.h>
+
 #define _GL_UNISTD_INLINE _GL_EXTERN_INLINE
 #include "unistd.h"
 typedef int dummy;
diff --git a/lib/unistd.in.h b/lib/unistd.in.h
index 5914fd5ae..73c882f97 100644
--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -1,18 +1,18 @@
 /* Substitute for and wrapper around <unistd.h>.
    Copyright (C) 2003-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _@GUARD_PREFIX@_UNISTD_H
 
@@ -1521,6 +1521,7 @@ _GL_WARN_ON_USE (group_member, "group_member is 
unportable - "
 #   undef isatty
 #   define isatty rpl_isatty
 #  endif
+#  define GNULIB_defined_isatty 1
 _GL_FUNCDECL_RPL (isatty, int, (int fd));
 _GL_CXXALIAS_RPL (isatty, int, (int fd));
 # elif defined _WIN32 && !defined __CYGWIN__
@@ -2027,15 +2028,23 @@ _GL_WARN_ON_USE (sleep, "sleep is unportable - "
 #if @GNULIB_MDA_SWAB@
 /* On native Windows, map 'swab' to '_swab', so that -loldnames is not
    required.  In C++ with GNULIB_NAMESPACE, avoid differences between
-   platforms by defining GNULIB_NAMESPACE::creat always.  */
+   platforms by defining GNULIB_NAMESPACE::swab always.  */
 # if defined _WIN32 && !defined __CYGWIN__
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   undef swab
 #   define swab _swab
 #  endif
-_GL_CXXALIAS_MDA (swab, void, (char *from, char *to, int n));
+/* Need to cast, because in old mingw the arguments are
+                             (const char *from, char *to, size_t n).  */
+_GL_CXXALIAS_MDA_CAST (swab, void, (char *from, char *to, int n));
 # else
+#  if defined __hpux /* HP-UX */
+_GL_CXXALIAS_SYS (swab, void, (const char *from, char *to, int n));
+#  elif defined __sun && !defined _XPG4 /* Solaris */
+_GL_CXXALIAS_SYS (swab, void, (const char *from, char *to, ssize_t n));
+#  else
 _GL_CXXALIAS_SYS (swab, void, (const void *from, void *to, ssize_t n));
+#  endif
 # endif
 _GL_CXXALIASWARN (swab);
 #endif
diff --git a/lib/unsetenv.c b/lib/unsetenv.c
index 005fb1f42..b2e910e39 100644
--- a/lib/unsetenv.c
+++ b/lib/unsetenv.c
@@ -1,12 +1,12 @@
 /* Copyright (C) 1992, 1995-2002, 2005-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/vasnprintf.c b/lib/vasnprintf.c
index 8d5100695..d9b669d15 100644
--- a/lib/vasnprintf.c
+++ b/lib/vasnprintf.c
@@ -1,18 +1,18 @@
 /* vsprintf with automatic memory allocation.
    Copyright (C) 1999, 2002-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* This file can be parametrized with the following macros:
      VASNPRINTF         The name of the function being defined.
@@ -60,10 +60,16 @@
 #ifndef VASNPRINTF
 # include <config.h>
 #endif
-#ifndef IN_LIBINTL
-# include <alloca.h>
+
+/* As of GCC 11.2.1, gcc -Wanalyzer-too-complex reports that main's
+   use of CHECK macros expands to code that is too complicated for gcc
+   -fanalyzer.  Suppress the resulting bogus warnings.  */
+#if 10 <= __GNUC__
+# pragma GCC diagnostic ignored "-Wanalyzer-null-argument"
 #endif
 
+#include <alloca.h>
+
 /* Specification.  */
 #ifndef VASNPRINTF
 # if WIDE_CHAR_VERSION
@@ -1924,7 +1930,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
 
     /* Ensures that allocated >= needed.  Aborts through a jump to
        out_of_memory if needed is SIZE_MAX or otherwise too big.  */
-#define ENSURE_ALLOCATION(needed) \
+#define ENSURE_ALLOCATION_ELSE(needed, oom_statement) \
     if ((needed) > allocated)                                                \
       {                                                                      \
         size_t memory_size;                                                  \
@@ -1935,17 +1941,19 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
           allocated = (needed);                                              \
         memory_size = xtimes (allocated, sizeof (DCHAR_T));                  \
         if (size_overflow_p (memory_size))                                   \
-          goto out_of_memory;                                                \
+          oom_statement                                                      \
         if (result == resultbuf || result == NULL)                           \
           memory = (DCHAR_T *) malloc (memory_size);                         \
         else                                                                 \
           memory = (DCHAR_T *) realloc (result, memory_size);                \
         if (memory == NULL)                                                  \
-          goto out_of_memory;                                                \
+          oom_statement                                                      \
         if (result == resultbuf && length > 0)                               \
           DCHAR_CPY (memory, result, length);                                \
         result = memory;                                                     \
       }
+#define ENSURE_ALLOCATION(needed) \
+  ENSURE_ALLOCATION_ELSE((needed), goto out_of_memory; )
 
     for (cp = format, i = 0, dp = &d.dir[0]; ; cp = dp->dir_end, i++, dp++)
       {
@@ -2193,7 +2201,8 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                           }
                         if (converted != result + length)
                           {
-                            ENSURE_ALLOCATION (xsum (length, converted_len));
+                            ENSURE_ALLOCATION_ELSE (xsum (length, 
converted_len),
+                                                    { free (converted); goto 
out_of_memory; });
                             DCHAR_CPY (result + length, converted, 
converted_len);
                             free (converted);
                           }
@@ -2317,7 +2326,8 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                           }
                         if (converted != result + length)
                           {
-                            ENSURE_ALLOCATION (xsum (length, converted_len));
+                            ENSURE_ALLOCATION_ELSE (xsum (length, 
converted_len),
+                                                    { free (converted); goto 
out_of_memory; });
                             DCHAR_CPY (result + length, converted, 
converted_len);
                             free (converted);
                           }
@@ -2441,7 +2451,8 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                           }
                         if (converted != result + length)
                           {
-                            ENSURE_ALLOCATION (xsum (length, converted_len));
+                            ENSURE_ALLOCATION_ELSE (xsum (length, 
converted_len),
+                                                    { free (converted); goto 
out_of_memory; });
                             DCHAR_CPY (result + length, converted, 
converted_len);
                             free (converted);
                           }
@@ -2944,7 +2955,8 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                         }
                     }
 #  else
-                  ENSURE_ALLOCATION (xsum (length, tmpdst_len));
+                  ENSURE_ALLOCATION_ELSE (xsum (length, tmpdst_len),
+                                          { free (tmpdst); goto out_of_memory; 
});
                   DCHAR_CPY (result + length, tmpdst, tmpdst_len);
                   free (tmpdst);
                   length += tmpdst_len;
@@ -3147,7 +3159,8 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                         }
                     }
 # else
-                  ENSURE_ALLOCATION (xsum (length, tmpdst_len));
+                  ENSURE_ALLOCATION_ELSE (xsum (length, tmpdst_len),
+                                          { free (tmpdst); goto out_of_memory; 
});
                   DCHAR_CPY (result + length, tmpdst, tmpdst_len);
                   free (tmpdst);
                   length += tmpdst_len;
@@ -5598,7 +5611,8 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
                             CLEANUP ();
                             return NULL;
                           }
-                        ENSURE_ALLOCATION (xsum (length, tmpdst_len));
+                        ENSURE_ALLOCATION_ELSE (xsum (length, tmpdst_len),
+                                                { free (tmpdst); goto 
out_of_memory; });
                         DCHAR_CPY (result + length, tmpdst, tmpdst_len);
                         free (tmpdst);
                         count = tmpdst_len;
diff --git a/lib/vasnprintf.h b/lib/vasnprintf.h
index aaed8599f..9b02cdf8a 100644
--- a/lib/vasnprintf.h
+++ b/lib/vasnprintf.h
@@ -1,18 +1,18 @@
 /* vsprintf with automatic memory allocation.
    Copyright (C) 2002-2004, 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _VASNPRINTF_H
 #define _VASNPRINTF_H
diff --git a/lib/verify.h b/lib/verify.h
index d1b499579..a8ca59b09 100644
--- a/lib/verify.h
+++ b/lib/verify.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2005-2006, 2009-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
@@ -25,7 +25,7 @@
    works as per C11.  This is supported by GCC 4.6.0+ and by clang 4+.
 
    Define _GL_HAVE__STATIC_ASSERT1 to 1 if _Static_assert (R) works as
-   per C2X.  This is supported by GCC 9.1+.
+   per C2x.  This is supported by GCC 9.1+.
 
    Support compilers claiming conformance to the relevant standard,
    and also support GCC when not pedantic.  If we were willing to slow
@@ -202,7 +202,7 @@ template <int w>
 
    This macro requires three or more arguments but uses at most the first
    two, so that the _Static_assert macro optionally defined below supports
-   both the C11 two-argument syntax and the C2X one-argument syntax.
+   both the C11 two-argument syntax and the C2x one-argument syntax.
 
    Unfortunately, unlike C11, this implementation must appear as an
    ordinary declaration, and cannot appear inside struct { ... }.  */
diff --git a/lib/vsnprintf.c b/lib/vsnprintf.c
index c94c5cb2d..4a0a3dc6a 100644
--- a/lib/vsnprintf.c
+++ b/lib/vsnprintf.c
@@ -2,18 +2,18 @@
    Copyright (C) 2004, 2006-2021 Free Software Foundation, Inc.
    Written by Simon Josefsson and Yoann Vandoorselaere <yoann@prelude-ids.org>.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Lesser General Public License 
along
-   with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifdef HAVE_CONFIG_H
 # include <config.h>
diff --git a/lib/w32sock.h b/lib/w32sock.h
index 9b6a2314b..635a1b228 100644
--- a/lib/w32sock.h
+++ b/lib/w32sock.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/wchar.in.h b/lib/wchar.in.h
index fe4171c54..919a5a37e 100644
--- a/lib/wchar.in.h
+++ b/lib/wchar.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2007-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Eric Blake.  */
 
@@ -111,7 +111,7 @@
 /* mingw and MSVC define wint_t as 'unsigned short' in <crtdefs.h> or
    <stddef.h>.  This is too small: ISO C 99 section 7.24.1.(2) says that
    wint_t must be "unchanged by default argument promotions".  Override it.  */
-# if @GNULIB_OVERRIDES_WINT_T@
+# if @GNULIBHEADERS_OVERRIDE_WINT_T@
 #  if !GNULIB_defined_wint_t
 #   if @HAVE_CRTDEFS_H@
 #    include <crtdefs.h>
diff --git a/lib/wcrtomb.c b/lib/wcrtomb.c
index 76d21ae62..5c9fd795b 100644
--- a/lib/wcrtomb.c
+++ b/lib/wcrtomb.c
@@ -2,12 +2,12 @@
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2008.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/wctype-h.c b/lib/wctype-h.c
index bb5f847e3..150221d6d 100644
--- a/lib/wctype-h.c
+++ b/lib/wctype-h.c
@@ -1,4 +1,23 @@
+/* Inline functions for <wctype.h>.
+
+   Copyright (C) 2012-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
 /* Normally this would be wctype.c, but that name's already taken.  */
+
 #include <config.h>
+
 #define _GL_WCTYPE_INLINE _GL_EXTERN_INLINE
 #include "wctype.h"
diff --git a/lib/wctype.in.h b/lib/wctype.in.h
index 6f0cd21a0..652d811ea 100644
--- a/lib/wctype.in.h
+++ b/lib/wctype.in.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2006-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Bruno Haible and Paul Eggert.  */
 
@@ -103,7 +103,7 @@ _GL_INLINE_HEADER_BEGIN
 /* mingw and MSVC define wint_t as 'unsigned short' in <crtdefs.h> or
    <stddef.h>.  This is too small: ISO C 99 section 7.24.1.(2) says that
    wint_t must be "unchanged by default argument promotions".  Override it.  */
-# if @GNULIB_OVERRIDES_WINT_T@
+# if @GNULIBHEADERS_OVERRIDE_WINT_T@
 #  if !GNULIB_defined_wint_t
 #   if @HAVE_CRTDEFS_H@
 #    include <crtdefs.h>
@@ -132,7 +132,7 @@ typedef unsigned int rpl_wint_t;
    same way, or not at all.  */
 # if ! @HAVE_ISWCNTRL@ || @REPLACE_ISWCNTRL@
 
-#  if @GNULIB_OVERRIDES_WINT_T@ /* implies @REPLACE_ISWCNTRL@ */
+#  if @GNULIBHEADERS_OVERRIDE_WINT_T@ /* implies @REPLACE_ISWCNTRL@ */
 
 _GL_WCTYPE_INLINE int
 rpl_iswalnum (wint_t wc)
@@ -496,7 +496,7 @@ _GL_FUNCDECL_RPL (iswxdigit, int, (wint_t wc));
 
 # endif
 
-# if defined __MINGW32__ && !@GNULIB_OVERRIDES_WINT_T@
+# if defined __MINGW32__ && !@GNULIBHEADERS_OVERRIDE_WINT_T@
 
 /* On native Windows, wchar_t is uint16_t, and wint_t is uint32_t.
    The functions towlower and towupper are implemented in the MSVCRT library
@@ -529,7 +529,7 @@ rpl_towupper (wint_t wc)
 #   define towupper rpl_towupper
 #  endif
 
-# endif /* __MINGW32__ && !@GNULIB_OVERRIDES_WINT_T@ */
+# endif /* __MINGW32__ && !@GNULIBHEADERS_OVERRIDE_WINT_T@ */
 
 # define GNULIB_defined_wctype_functions 1
 #endif
@@ -646,7 +646,7 @@ _GL_WARN_ON_USE (wctype, "wctype is unportable - "
    The argument WC must be either a wchar_t value or WEOF.
    The argument DESC must have been returned by the wctype() function.  */
 #if @GNULIB_ISWCTYPE@
-# if @GNULIB_OVERRIDES_WINT_T@
+# if @GNULIBHEADERS_OVERRIDE_WINT_T@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   undef iswctype
 #   define iswctype rpl_iswctype
diff --git a/lib/windows-initguard.h b/lib/windows-initguard.h
index e84051e1e..7999b2339 100644
--- a/lib/windows-initguard.h
+++ b/lib/windows-initguard.h
@@ -1,18 +1,18 @@
 /* Init guards, somewhat like spinlocks (native Windows implementation).
    Copyright (C) 2005-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2005.
    Based on GCC's gthr-win32.h.  */
diff --git a/lib/write.c b/lib/write.c
index bc53d4dcf..614cdc62f 100644
--- a/lib/write.c
+++ b/lib/write.c
@@ -2,12 +2,12 @@
    Copyright (C) 2008-2021 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2008.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
diff --git a/lib/xalloc-oversized.h b/lib/xalloc-oversized.h
index d25596932..4184f3395 100644
--- a/lib/xalloc-oversized.h
+++ b/lib/xalloc-oversized.h
@@ -2,12 +2,12 @@
 
    Copyright (C) 1990-2000, 2003-2004, 2006-2021 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
@@ -22,33 +22,38 @@
 #include <stdint.h>
 
 /* True if N * S does not fit into both ptrdiff_t and size_t.
-   S must be positive and N must be nonnegative.
+   N and S should be nonnegative and free of side effects.
    This expands to a constant expression if N and S are both constants.
    By gnulib convention, SIZE_MAX represents overflow in size_t
    calculations, so the conservative size_t-based dividend to use here
    is SIZE_MAX - 1.  */
 #define __xalloc_oversized(n, s) \
-  ((size_t) (PTRDIFF_MAX < SIZE_MAX ? PTRDIFF_MAX : SIZE_MAX - 1) / (s) < (n))
+  ((s) != 0 \
+   && ((size_t) (PTRDIFF_MAX < SIZE_MAX ? PTRDIFF_MAX : SIZE_MAX - 1) / (s) \
+       < (n)))
 
-#if PTRDIFF_MAX < SIZE_MAX
-typedef ptrdiff_t xalloc_count_t;
-#else
-typedef size_t xalloc_count_t;
-#endif
+/* Return 1 if and only if an array of N objects, each of size S,
+   cannot exist reliably because its total size in bytes would exceed
+   MIN (PTRDIFF_MAX, SIZE_MAX - 1).
+
+   N and S should be nonnegative and free of side effects.
+
+   Warning: (xalloc_oversized (N, S) ? NULL : malloc (N * S)) can
+   misbehave if N and S are both narrower than ptrdiff_t and size_t,
+   and can be rewritten as (xalloc_oversized (N, S) ?  NULL
+   : malloc (N * (size_t) S)).
 
-/* Return 1 if an array of N objects, each of size S, cannot exist reliably
-   because its total size in bytes exceeds MIN (PTRDIFF_MAX, SIZE_MAX).
-   N must be nonnegative, S must be positive, and either N or S should be
-   of type ptrdiff_t or size_t or wider.  This is a macro, not a function,
-   so that it works even if an argument exceeds MAX (PTRDIFF_MAX, SIZE_MAX).  
*/
-#if 7 <= __GNUC__ && !defined __clang__
+   This is a macro, not a function, so that it works even if an
+   argument exceeds MAX (PTRDIFF_MAX, SIZE_MAX).  */
+#if 7 <= __GNUC__ && !defined __clang__ && PTRDIFF_MAX < SIZE_MAX
 # define xalloc_oversized(n, s) \
-   __builtin_mul_overflow_p (n, s, (xalloc_count_t) 1)
-#elif 5 <= __GNUC__ && !defined __ICC && !__STRICT_ANSI__
+   __builtin_mul_overflow_p (n, s, (ptrdiff_t) 1)
+#elif (5 <= __GNUC__ && !defined __ICC && !__STRICT_ANSI__ \
+       && PTRDIFF_MAX < SIZE_MAX)
 # define xalloc_oversized(n, s) \
    (__builtin_constant_p (n) && __builtin_constant_p (s) \
     ? __xalloc_oversized (n, s) \
-    : ({ xalloc_count_t __xalloc_count; \
+    : ({ ptrdiff_t __xalloc_count; \
          __builtin_mul_overflow (n, s, &__xalloc_count); }))
 
 /* Other compilers use integer division; this may be slower but is
diff --git a/lib/xsize.c b/lib/xsize.c
index 4b4914c2c..b3d73a2d8 100644
--- a/lib/xsize.c
+++ b/lib/xsize.c
@@ -1,3 +1,21 @@
+/* Checked size_t computations.
+
+   Copyright (C) 2012-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
 #include <config.h>
+
 #define XSIZE_INLINE _GL_EXTERN_INLINE
 #include "xsize.h"
diff --git a/lib/xsize.h b/lib/xsize.h
index d4d7b1c7c..91fa877ce 100644
--- a/lib/xsize.h
+++ b/lib/xsize.h
@@ -2,18 +2,18 @@
 
    Copyright (C) 2003, 2008-2021 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
 
-   This program is distributed in the hope that it will be useful,
+   This file is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
-   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifndef _XSIZE_H
 #define _XSIZE_H
diff --git a/m4/arpa_inet_h.m4 b/m4/arpa_inet_h.m4
index c4e386d1f..a3ba25624 100644
--- a/m4/arpa_inet_h.m4
+++ b/m4/arpa_inet_h.m4
@@ -1,4 +1,4 @@
-# arpa_inet_h.m4 serial 14
+# arpa_inet_h.m4 serial 17
 dnl Copyright (C) 2006, 2008-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,10 +6,10 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl Written by Simon Josefsson and Bruno Haible
 
-AC_DEFUN([gl_HEADER_ARPA_INET],
+AC_DEFUN_ONCE([gl_ARPA_INET_H],
 [
-  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
-  dnl once only, before all statements that occur in other macros.
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
   AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
 
   AC_CHECK_HEADERS_ONCE([arpa/inet.h])
@@ -40,17 +40,32 @@ AC_DEFUN([gl_HEADER_ARPA_INET],
     ]], [inet_ntop inet_pton])
 ])
 
+# gl_ARPA_INET_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_ARPA_INET_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_ARPA_INET_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_ARPA_INET_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_ARPA_INET_H_MODULE_INDICATOR_DEFAULTS], 
[
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_INET_NTOP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_INET_PTON])
+  ])
+  
m4_require(GL_MODULE_INDICATOR_PREFIX[_ARPA_INET_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_ARPA_INET_H_DEFAULTS],
 [
-  GNULIB_INET_NTOP=0;     AC_SUBST([GNULIB_INET_NTOP])
-  GNULIB_INET_PTON=0;     AC_SUBST([GNULIB_INET_PTON])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_DECL_INET_NTOP=1;  AC_SUBST([HAVE_DECL_INET_NTOP])
   HAVE_DECL_INET_PTON=1;  AC_SUBST([HAVE_DECL_INET_PTON])
diff --git a/m4/dirent_h.m4 b/m4/dirent_h.m4
index 6d8614258..17e2a20c5 100644
--- a/m4/dirent_h.m4
+++ b/m4/dirent_h.m4
@@ -1,4 +1,4 @@
-# dirent_h.m4 serial 16
+# dirent_h.m4 serial 19
 dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,10 +6,10 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl Written by Bruno Haible.
 
-AC_DEFUN([gl_DIRENT_H],
+AC_DEFUN_ONCE([gl_DIRENT_H],
 [
-  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
-  dnl once only, before all statements that occur in other macros.
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
   AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
 
   dnl <dirent.h> is always overridden, because of GNULIB_POSIXCHECK.
@@ -27,26 +27,41 @@ AC_DEFUN([gl_DIRENT_H],
     ]], [alphasort closedir dirfd fdopendir opendir readdir rewinddir scandir])
 ])
 
+# gl_DIRENT_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_DIRENT_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_DIRENT_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_DIRENT_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_DIRENT_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_UNISTD_H_REQUIRE_DEFAULTS dnl for REPLACE_FCHDIR
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OPENDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_READDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REWINDDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CLOSEDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_DIRFD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FDOPENDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SCANDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ALPHASORT])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_DIRENT_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_DIRENT_H_DEFAULTS],
 [
-  AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) dnl for REPLACE_FCHDIR
-  GNULIB_OPENDIR=0;     AC_SUBST([GNULIB_OPENDIR])
-  GNULIB_READDIR=0;     AC_SUBST([GNULIB_READDIR])
-  GNULIB_REWINDDIR=0;   AC_SUBST([GNULIB_REWINDDIR])
-  GNULIB_CLOSEDIR=0;    AC_SUBST([GNULIB_CLOSEDIR])
-  GNULIB_DIRFD=0;       AC_SUBST([GNULIB_DIRFD])
-  GNULIB_FDOPENDIR=0;   AC_SUBST([GNULIB_FDOPENDIR])
-  GNULIB_SCANDIR=0;     AC_SUBST([GNULIB_SCANDIR])
-  GNULIB_ALPHASORT=0;   AC_SUBST([GNULIB_ALPHASORT])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_OPENDIR=1;       AC_SUBST([HAVE_OPENDIR])
   HAVE_READDIR=1;       AC_SUBST([HAVE_READDIR])
diff --git a/m4/environ.m4 b/m4/environ.m4
index d97177086..ae5329108 100644
--- a/m4/environ.m4
+++ b/m4/environ.m4
@@ -1,4 +1,4 @@
-# environ.m4 serial 7
+# environ.m4 serial 8
 dnl Copyright (C) 2001-2004, 2006-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -33,7 +33,8 @@ AC_DEFUN([gt_CHECK_VAR_DECL],
     [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
           [[$1
-            extern struct { int foo; } $2;]],
+            typedef struct { int foo; } foo_t;
+            extern foo_t $2;]],
           [[$2.foo = 1;]])],
        [gt_cv_var=no],
        [gt_cv_var=yes])])
diff --git a/m4/fcntl_h.m4 b/m4/fcntl_h.m4
index e63a82f10..aba44735d 100644
--- a/m4/fcntl_h.m4
+++ b/m4/fcntl_h.m4
@@ -1,4 +1,4 @@
-# serial 17
+# serial 20
 # Configure fcntl.h.
 dnl Copyright (C) 2006-2007, 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
@@ -7,7 +7,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl Written by Paul Eggert.
 
-AC_DEFUN([gl_FCNTL_H],
+AC_DEFUN_ONCE([gl_FCNTL_H],
 [
   AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
   AC_REQUIRE([gl_FCNTL_O_FLAGS])
@@ -26,25 +26,40 @@ AC_DEFUN([gl_FCNTL_H],
     ]], [fcntl openat])
 ])
 
+# gl_FCNTL_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_FCNTL_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_FCNTL_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_FCNTL_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_FCNTL_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CREAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FCNTL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_NONBLOCKING])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OPEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OPENAT])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_CREAT], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_OPEN], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_FCNTL_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_FCNTL_H_DEFAULTS],
 [
-  GNULIB_CREAT=0;        AC_SUBST([GNULIB_CREAT])
-  GNULIB_FCNTL=0;        AC_SUBST([GNULIB_FCNTL])
-  GNULIB_NONBLOCKING=0;  AC_SUBST([GNULIB_NONBLOCKING])
-  GNULIB_OPEN=0;         AC_SUBST([GNULIB_OPEN])
-  GNULIB_OPENAT=0;       AC_SUBST([GNULIB_OPENAT])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_CREAT=1;    AC_SUBST([GNULIB_MDA_CREAT])
-  GNULIB_MDA_OPEN=1;     AC_SUBST([GNULIB_MDA_OPEN])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_FCNTL=1;          AC_SUBST([HAVE_FCNTL])
   HAVE_OPENAT=1;         AC_SUBST([HAVE_OPENAT])
diff --git a/m4/flock.m4 b/m4/flock.m4
index eb46642d8..e1e5fe030 100644
--- a/m4/flock.m4
+++ b/m4/flock.m4
@@ -1,4 +1,4 @@
-# flock.m4 serial 3
+# flock.m4 serial 4
 dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN([gl_FUNC_FLOCK],
 [
-  AC_REQUIRE([gl_HEADER_SYS_FILE_H_DEFAULTS])
+  AC_REQUIRE([gl_SYS_FILE_H_DEFAULTS])
   AC_CHECK_FUNCS_ONCE([flock])
   if test $ac_cv_func_flock = no; then
     HAVE_FLOCK=0
diff --git a/m4/fstat.m4 b/m4/fstat.m4
index 3b5b238fa..cdaca80da 100644
--- a/m4/fstat.m4
+++ b/m4/fstat.m4
@@ -1,4 +1,4 @@
-# fstat.m4 serial 7
+# fstat.m4 serial 8
 dnl Copyright (C) 2011-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -34,7 +34,7 @@ AC_DEFUN([gl_FUNC_FSTAT],
 
 # Prerequisites of lib/fstat.c and lib/stat-w32.c.
 AC_DEFUN([gl_PREREQ_FSTAT], [
-  AC_REQUIRE([gl_HEADER_SYS_STAT_H])
+  AC_REQUIRE([gl_SYS_STAT_H])
   AC_REQUIRE([gl_PREREQ_STAT_W32])
   :
 ])
diff --git a/m4/getaddrinfo.m4 b/m4/getaddrinfo.m4
index 97889a8b5..3f8e04f9b 100644
--- a/m4/getaddrinfo.m4
+++ b/m4/getaddrinfo.m4
@@ -1,4 +1,4 @@
-# getaddrinfo.m4 serial 33
+# getaddrinfo.m4 serial 34
 dnl Copyright (C) 2004-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,8 +6,8 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN([gl_GETADDRINFO],
 [
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
-  AC_REQUIRE([gl_HEADER_NETDB])dnl for HAVE_NETDB_H
+  AC_REQUIRE([gl_SYS_SOCKET_H])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
+  AC_REQUIRE([gl_NETDB_H])dnl for HAVE_NETDB_H
   GETADDRINFO_LIB=
   gai_saved_LIBS="$LIBS"
 
@@ -156,13 +156,13 @@ const char *gai_strerror(int);]])],
 # Prerequisites of lib/netdb.in.h and lib/getaddrinfo.c.
 AC_DEFUN([gl_PREREQ_GETADDRINFO], [
   AC_REQUIRE([gl_NETDB_H_DEFAULTS])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
+  AC_REQUIRE([gl_SYS_SOCKET_H])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
   AC_REQUIRE([gl_HOSTENT]) dnl for HOSTENT_LIB
   AC_REQUIRE([gl_SERVENT]) dnl for SERVENT_LIB
   AC_REQUIRE([gl_FUNC_INET_NTOP]) dnl for INET_NTOP_LIB
   AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([gl_SOCKET_FAMILIES])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
   dnl Including sys/socket.h is wrong for Windows, but Windows does not
diff --git a/m4/gnulib-cache.m4 b/m4/gnulib-cache.m4
index 9e6b41b4a..841bd6140 100644
--- a/m4/gnulib-cache.m4
+++ b/m4/gnulib-cache.m4
@@ -242,7 +242,7 @@ gl_MODULES([
   warnings
   wchar
 ])
-gl_AVOID([ lock unistr/base unistr/u8-mbtouc unistr/u8-mbtouc-unsafe 
unistr/u8-mbtoucr unistr/u8-prev unistr/u8-uctomb unitypes])
+gl_AVOID([lock unistr/base unistr/u8-mbtouc unistr/u8-mbtouc-unsafe 
unistr/u8-mbtoucr unistr/u8-prev unistr/u8-uctomb unitypes])
 gl_SOURCE_BASE([lib])
 gl_M4_BASE([m4])
 gl_PO_BASE([])
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4
index f2eff10de..ddbc7b773 100644
--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 63
+# gnulib-common.m4 serial 66
 dnl Copyright (C) 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -103,6 +103,12 @@ AC_DEFUN([gl_COMMON_BODY], [
 # define _GL_ATTR_warn_unused_result _GL_GNUC_PREREQ (3, 4)
 #endif
 
+#ifdef __has_c_attribute
+# define _GL_HAS_C_ATTRIBUTE(attr) __has_c_attribute (__##attr##__)
+#else
+# define _GL_HAS_C_ATTRIBUTE(attr) 0
+#endif
+
 ]dnl There is no _GL_ATTRIBUTE_ALIGNED; use stdalign's _Alignas instead.
 [
 #if _GL_HAS_ATTRIBUTE (alloc_size)
@@ -142,7 +148,20 @@ AC_DEFUN([gl_COMMON_BODY], [
 # define _GL_ATTRIBUTE_CONST
 #endif
 
-#if 201710L < __STDC_VERSION__
+/* _GL_ATTRIBUTE_DEALLOC (F, I) is for functions returning pointers
+   that can be freed by passing them as the Ith argument to the
+   function F.  _GL_ATTRIBUTE_DEALLOC_FREE is for functions that
+   return pointers that can be freed via 'free'; it can be used
+   only after including stdlib.h.  These macros cannot be used on
+   inline functions.  */
+#if _GL_GNUC_PREREQ (11, 0)
+# define _GL_ATTRIBUTE_DEALLOC(f, i) __attribute__ ((__malloc__ (f, i)))
+#else
+# define _GL_ATTRIBUTE_DEALLOC(f, i)
+#endif
+#define _GL_ATTRIBUTE_DEALLOC_FREE _GL_ATTRIBUTE_DEALLOC (free, 1)
+
+#if _GL_HAS_C_ATTRIBUTE (deprecated)
 # define _GL_ATTRIBUTE_DEPRECATED [[__deprecated__]]
 #elif _GL_HAS_ATTRIBUTE (deprecated)
 # define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
@@ -168,7 +187,7 @@ AC_DEFUN([gl_COMMON_BODY], [
 #endif
 
 /* FALLTHROUGH is special, because it always expands to something.  */
-#if 201710L < __STDC_VERSION__
+#if _GL_HAS_C_ATTRIBUTE (fallthrough)
 # define _GL_ATTRIBUTE_FALLTHROUGH [[__fallthrough__]]
 #elif _GL_HAS_ATTRIBUTE (fallthrough)
 # define _GL_ATTRIBUTE_FALLTHROUGH __attribute__ ((__fallthrough__))
@@ -195,15 +214,12 @@ AC_DEFUN([gl_COMMON_BODY], [
 # define _GL_ATTRIBUTE_MAY_ALIAS
 #endif
 
-#if 201710L < __STDC_VERSION__
+#if _GL_HAS_C_ATTRIBUTE (maybe_unused)
 # define _GL_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]]
-#elif _GL_HAS_ATTRIBUTE (unused)
-# define _GL_ATTRIBUTE_MAYBE_UNUSED __attribute__ ((__unused__))
 #else
-# define _GL_ATTRIBUTE_MAYBE_UNUSED
+# define _GL_ATTRIBUTE_MAYBE_UNUSED _GL_ATTRIBUTE_UNUSED
 #endif
 /* Earlier spellings of this macro.  */
-#define _GL_UNUSED _GL_ATTRIBUTE_MAYBE_UNUSED
 #define _UNUSED_PARAMETER_ _GL_ATTRIBUTE_MAYBE_UNUSED
 
 #if _GL_HAS_ATTRIBUTE (malloc)
@@ -212,7 +228,7 @@ AC_DEFUN([gl_COMMON_BODY], [
 # define _GL_ATTRIBUTE_MALLOC
 #endif
 
-#if 201710L < __STDC_VERSION__
+#if _GL_HAS_C_ATTRIBUTE (nodiscard)
 # define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]]
 #elif _GL_HAS_ATTRIBUTE (warn_unused_result)
 # define _GL_ATTRIBUTE_NODISCARD __attribute__ ((__warn_unused_result__))
@@ -270,11 +286,19 @@ AC_DEFUN([gl_COMMON_BODY], [
 # define _GL_ATTRIBUTE_SENTINEL(pos)
 #endif
 
+#if _GL_HAS_ATTRIBUTE (unused)
+# define _GL_ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#else
+# define _GL_ATTRIBUTE_UNUSED
+#endif
+/* Earlier spellings of this macro.  */
+#define _GL_UNUSED _GL_ATTRIBUTE_UNUSED
+
 ]dnl There is no _GL_ATTRIBUTE_VISIBILITY; see m4/visibility.m4 instead.
 [
 /* To support C++ as well as C, use _GL_UNUSED_LABEL with trailing ';'.  */
 #if !defined __cplusplus || _GL_GNUC_PREREQ (4, 5)
-# define _GL_UNUSED_LABEL _GL_ATTRIBUTE_MAYBE_UNUSED
+# define _GL_UNUSED_LABEL _GL_ATTRIBUTE_UNUSED
 #else
 # define _GL_UNUSED_LABEL
 #endif
@@ -357,6 +381,16 @@ AC_DEFUN([gl_COMMON_BODY], [
   export LIBC_FATAL_STDERR_
 ])
 
+# gl_MODULE_INDICATOR_INIT_VARIABLE([variablename])
+# gl_MODULE_INDICATOR_INIT_VARIABLE([variablename], [initialvalue])
+# initializes the shell variable that indicates the presence of the given 
module
+# as a C preprocessor expression.
+AC_DEFUN([gl_MODULE_INDICATOR_INIT_VARIABLE],
+[
+  GL_MODULE_INDICATOR_PREFIX[]_[$1]=m4_if([$2], , [0], [$2])
+  AC_SUBST(GL_MODULE_INDICATOR_PREFIX[]_[$1])
+])
+
 # gl_MODULE_INDICATOR_CONDITION
 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
 # whether a gnulib module that has been requested shall be considered present
@@ -369,9 +403,9 @@ m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
 [
   gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
-    [GNULIB_[]m4_translit([[$1]],
-                          [abcdefghijklmnopqrstuvwxyz./-],
-                          [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
+    [GL_MODULE_INDICATOR_PREFIX[]_GNULIB_[]m4_translit([[$1]],
+                                                       
[abcdefghijklmnopqrstuvwxyz./-],
+                                                       
[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
     [gl_MODULE_INDICATOR_CONDITION])
 ])
 
@@ -656,6 +690,72 @@ AC_DEFUN([gl_CACHE_VAL_SILENT],
   ])
 ])
 
+# gl_CC_ALLOW_WARNINGS
+# sets and substitutes a variable GL_CFLAG_ALLOW_WARNINGS, to a $(CC) option
+# that reverts a preceding '-Werror' option, if available.
+# This is expected to be '-Wno-error' on gcc, clang (except clang/MSVC), 
xlclang
+# and empty otherwise.
+AC_DEFUN([gl_CC_ALLOW_WARNINGS],
+[
+  AC_REQUIRE([AC_PROG_CC])
+  AC_CACHE_CHECK([for C compiler option to allow warnings],
+    [gl_cv_cc_wallow],
+    [rm -f conftest*
+     echo 'int dummy;' > conftest.c
+     AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c 
2>conftest1.err]) >/dev/null
+     AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Wno-error -c conftest.c 
2>conftest2.err]) >/dev/null
+     dnl Test the number of error output lines, because AIX xlc accepts the
+     dnl option '-Wno-error', just to produce a warning
+     dnl "Option -Wno-error was incorrectly specified. The option will be 
ignored."
+     dnl afterwards.
+     if test $? = 0 && test `wc -l < conftest1.err` = `wc -l < conftest2.err`; 
then
+       gl_cv_cc_wallow='-Wno-error'
+     else
+       gl_cv_cc_wallow=none
+     fi
+     rm -f conftest*
+    ])
+  case "$gl_cv_cc_wallow" in
+    none) GL_CFLAG_ALLOW_WARNINGS='' ;;
+    *)    GL_CFLAG_ALLOW_WARNINGS="$gl_cv_cc_wallow" ;;
+  esac
+  AC_SUBST([GL_CFLAG_ALLOW_WARNINGS])
+])
+
+# gl_CXX_ALLOW_WARNINGS
+# sets and substitutes a variable GL_CXXFLAG_ALLOW_WARNINGS, to a $(CC) option
+# that reverts a preceding '-Werror' option, if available.
+AC_DEFUN([gl_CXX_ALLOW_WARNINGS],
+[
+  dnl Requires AC_PROG_CXX or gl_PROG_ANSI_CXX.
+  if test -n "$CXX" && test "$CXX" != no; then
+    AC_CACHE_CHECK([for C++ compiler option to allow warnings],
+      [gl_cv_cxx_wallow],
+      [rm -f conftest*
+       echo 'int dummy;' > conftest.cc
+       AC_TRY_COMMAND([${CXX-c++} $CXXFLAGS $CPPFLAGS -c conftest.cc 
2>conftest1.err]) >/dev/null
+       AC_TRY_COMMAND([${CXX-c++} $CXXFLAGS $CPPFLAGS -Wno-error -c 
conftest.cc 2>conftest2.err]) >/dev/null
+       dnl Test the number of error output lines, because AIX xlC accepts the
+       dnl option '-Wno-error', just to produce a warning
+       dnl "Option -Wno-error was incorrectly specified. The option will be 
ignored."
+       dnl afterwards.
+       if test $? = 0 && test `wc -l < conftest1.err` = `wc -l < 
conftest2.err`; then
+         gl_cv_cxx_wallow='-Wno-error'
+       else
+         gl_cv_cxx_wallow=none
+       fi
+       rm -f conftest*
+      ])
+    case "$gl_cv_cxx_wallow" in
+      none) GL_CXXFLAG_ALLOW_WARNINGS='' ;;
+      *)    GL_CXXFLAG_ALLOW_WARNINGS="$gl_cv_cxx_wallow" ;;
+    esac
+  else
+    GL_CXXFLAG_ALLOW_WARNINGS=''
+  fi
+  AC_SUBST([GL_CXXFLAG_ALLOW_WARNINGS])
+])
+
 dnl Expands to some code for use in .c programs that, on native Windows, 
defines
 dnl the Microsoft deprecated alias function names to the underscore-prefixed
 dnl actual function names. With this macro, these function names are available
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 1290d7589..0ae96ead7 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -142,6 +142,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module langinfo:
   # Code from module largefile:
   AC_REQUIRE([AC_SYS_LARGEFILE])
+  AC_REQUIRE([gl_YEAR2038_EARLY])
   # Code from module ldexp:
   # Code from module lib-symbol-versions:
   # Code from module lib-symbol-visibility:
@@ -281,9 +282,11 @@ AC_DEFUN([gl_INIT],
   m4_pushdef([AC_LIBSOURCES], m4_defn([gl_LIBSOURCES]))
   m4_pushdef([gl_LIBSOURCES_LIST], [])
   m4_pushdef([gl_LIBSOURCES_DIR], [])
+  m4_pushdef([GL_MACRO_PREFIX], [gl])
+  m4_pushdef([GL_MODULE_INDICATOR_PREFIX], [GL])
   gl_COMMON
   gl_source_base='lib'
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([accept])
   fi
@@ -291,9 +294,10 @@ AC_DEFUN([gl_INIT],
   gl_FUNC_ACCEPT4
   gl_SYS_SOCKET_MODULE_INDICATOR([accept4])
   gl_FUNC_ALLOCA
-  gl_HEADER_ARPA_INET
+  gl_ARPA_INET_H
+  gl_ARPA_INET_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([bind])
   fi
@@ -317,7 +321,7 @@ AC_DEFUN([gl_INIT],
     AC_LIBOBJ([close])
   fi
   gl_UNISTD_MODULE_INDICATOR([close])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([connect])
   fi
@@ -328,6 +332,7 @@ AC_DEFUN([gl_INIT],
   fi
   gl_MATH_MODULE_INDICATOR([copysign])
   gl_DIRENT_H
+  gl_DIRENT_H_REQUIRE_DEFAULTS
   gl_FUNC_DIRFD
   if test $ac_cv_func_dirfd = no && test $gl_cv_func_dirfd_macro = no \
      || test $REPLACE_DIRFD = 1; then
@@ -347,6 +352,7 @@ AC_DEFUN([gl_INIT],
   gl_HEADER_ERRNO_H
   AC_REQUIRE([gl_EXTERN_INLINE])
   gl_FCNTL_H
+  gl_FCNTL_H_REQUIRE_DEFAULTS
   AC_C_FLEXIBLE_ARRAY_MEMBER
   gl_FLOAT_H
   if test $REPLACE_FLOAT_LDBL = 1; then
@@ -360,7 +366,7 @@ AC_DEFUN([gl_INIT],
     AC_LIBOBJ([flock])
     gl_PREREQ_FLOCK
   fi
-  gl_HEADER_SYS_FILE_MODULE_INDICATOR([flock])
+  gl_SYS_FILE_MODULE_INDICATOR([flock])
   AC_REQUIRE([gl_FUNC_FLOOR])
   if test $REPLACE_FLOOR = 1; then
     AC_LIBOBJ([floor])
@@ -409,17 +415,17 @@ AC_DEFUN([gl_INIT],
   fi
   gl_UNISTD_MODULE_INDICATOR([getlogin])
   AC_REQUIRE([gl_LIB_GETLOGIN])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([getpeername])
   fi
   gl_SYS_SOCKET_MODULE_INDICATOR([getpeername])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([getsockname])
   fi
   gl_SYS_SOCKET_MODULE_INDICATOR([getsockname])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([getsockopt])
   fi
@@ -439,6 +445,7 @@ AC_DEFUN([gl_INIT],
   m4_ifdef([gl_ICONV_MODULE_INDICATOR],
     [gl_ICONV_MODULE_INDICATOR([iconv])])
   gl_ICONV_H
+  gl_ICONV_H_REQUIRE_DEFAULTS
   gl_FUNC_ICONV_OPEN
   if test $REPLACE_ICONV_OPEN = 1; then
     AC_LIBOBJ([iconv_open])
@@ -461,6 +468,7 @@ AC_DEFUN([gl_INIT],
   fi
   gl_ARPA_INET_MODULE_INDICATOR([inet_pton])
   gl_INTTYPES_INCOMPLETE
+  gl_INTTYPES_H_REQUIRE_DEFAULTS
   gl_ISFINITE
   if test $REPLACE_ISFINITE = 1; then
     AC_LIBOBJ([isfinite])
@@ -501,6 +509,7 @@ AC_DEFUN([gl_INIT],
   fi
   gl_MATH_MODULE_INDICATOR([isnanl])
   gl_LANGINFO_H
+  gl_LANGINFO_H_REQUIRE_DEFAULTS
   AC_REQUIRE([gl_LARGEFILE])
   gl_FUNC_LDEXP
   gl_LD_VERSION_SCRIPT
@@ -512,7 +521,7 @@ AC_DEFUN([gl_INIT],
     AC_LIBOBJ([link])
   fi
   gl_UNISTD_MODULE_INDICATOR([link])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([listen])
   fi
@@ -522,6 +531,7 @@ AC_DEFUN([gl_INIT],
   LOCALCHARSET_TESTS_ENVIRONMENT=
   AC_SUBST([LOCALCHARSET_TESTS_ENVIRONMENT])
   gl_LOCALE_H
+  gl_LOCALE_H_REQUIRE_DEFAULTS
   gl_FUNC_LOG1P
   if test $HAVE_LOG1P = 0 || test $REPLACE_LOG1P = 1; then
     AC_LIBOBJ([log1p])
@@ -541,15 +551,14 @@ AC_DEFUN([gl_INIT],
   if test $REPLACE_MALLOC = 1; then
     AC_LIBOBJ([malloc])
   fi
-  gl_MODULE_INDICATOR([malloc-gnu])
-  gl_FUNC_MALLOC_POSIX
+  AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
   if test $REPLACE_MALLOC = 1; then
     AC_LIBOBJ([malloc])
   fi
   gl_STDLIB_MODULE_INDICATOR([malloc-posix])
-  gl_MODULE_INDICATOR([malloc-posix])
   gl_MALLOCA
   gl_MATH_H
+  gl_MATH_H_REQUIRE_DEFAULTS
   gl_MINMAX
   gl_FUNC_MKDIR
   if test $REPLACE_MKDIR = 1; then
@@ -573,7 +582,8 @@ AC_DEFUN([gl_INIT],
   fi
   gl_MODULE_INDICATOR([msvc-nothrow])
   gl_MULTIARCH
-  gl_HEADER_NETDB
+  gl_NETDB_H
+  gl_NETDB_H_REQUIRE_DEFAULTS
   gl_HEADER_NETINET_IN
   AC_PROG_MKDIR_P
   gl_FUNC_NL_LANGINFO
@@ -607,6 +617,7 @@ AC_DEFUN([gl_INIT],
   fi
   gl_POLL_MODULE_INDICATOR([poll])
   gl_POLL_H
+  gl_POLL_H_REQUIRE_DEFAULTS
   gl_FUNC_PUTENV
   if test $REPLACE_PUTENV = 1; then
     AC_LIBOBJ([putenv])
@@ -625,12 +636,12 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_READLINK
   fi
   gl_UNISTD_MODULE_INDICATOR([readlink])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([recv])
   fi
   gl_SYS_SOCKET_MODULE_INDICATOR([recv])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([recvfrom])
   fi
@@ -657,12 +668,12 @@ AC_DEFUN([gl_INIT],
     AC_LIBOBJ([select])
   fi
   gl_SYS_SELECT_MODULE_INDICATOR([select])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([send])
   fi
   gl_SYS_SOCKET_MODULE_INDICATOR([send])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([sendto])
   fi
@@ -672,25 +683,26 @@ AC_DEFUN([gl_INIT],
     AC_LIBOBJ([setenv])
   fi
   gl_STDLIB_MODULE_INDICATOR([setenv])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([setsockopt])
   fi
   gl_SYS_SOCKET_MODULE_INDICATOR([setsockopt])
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([shutdown])
   fi
   gl_SYS_SOCKET_MODULE_INDICATOR([shutdown])
   gl_SIGNAL_H
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  gl_SIGNAL_H_REQUIRE_DEFAULTS
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([socket])
   fi
   # When this module is used, sockets may actually occur as file descriptors,
   # hence it is worth warning if the modules 'close' and 'ioctl' are not used.
-  m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
-  m4_ifdef([gl_SYS_IOCTL_H_DEFAULTS], [AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])])
+  m4_ifdef([gl_UNISTD_H_DEFAULTS], [gl_UNISTD_H_REQUIRE_DEFAULTS])
+  m4_ifdef([gl_SYS_IOCTL_H_DEFAULTS], [gl_SYS_IOCTL_H_REQUIRE_DEFAULTS])
   AC_REQUIRE([gl_PREREQ_SYS_H_WINSOCK2])
   if test "$ac_cv_header_winsock2_h" = yes; then
     UNISTD_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS=1
@@ -705,31 +717,67 @@ AC_DEFUN([gl_INIT],
   gl_STDALIGN_H
   AM_STDBOOL_H
   gl_STDDEF_H
+  gl_STDDEF_H_REQUIRE_DEFAULTS
   gl_STDINT_H
   gl_STDIO_H
+  gl_STDIO_H_REQUIRE_DEFAULTS
+  dnl No need to create extra modules for these functions. Everyone who uses
+  dnl <stdio.h> likely needs them.
+  gl_STDIO_MODULE_INDICATOR([fscanf])
+  gl_MODULE_INDICATOR([fscanf])
+  gl_STDIO_MODULE_INDICATOR([scanf])
+  gl_MODULE_INDICATOR([scanf])
+  gl_STDIO_MODULE_INDICATOR([fgetc])
+  gl_STDIO_MODULE_INDICATOR([getc])
+  gl_STDIO_MODULE_INDICATOR([getchar])
+  gl_STDIO_MODULE_INDICATOR([fgets])
+  gl_STDIO_MODULE_INDICATOR([fread])
+  dnl No need to create extra modules for these functions. Everyone who uses
+  dnl <stdio.h> likely needs them.
+  gl_STDIO_MODULE_INDICATOR([fprintf])
+  gl_STDIO_MODULE_INDICATOR([printf])
+  gl_STDIO_MODULE_INDICATOR([vfprintf])
+  gl_STDIO_MODULE_INDICATOR([vprintf])
+  gl_STDIO_MODULE_INDICATOR([fputc])
+  gl_STDIO_MODULE_INDICATOR([putc])
+  gl_STDIO_MODULE_INDICATOR([putchar])
+  gl_STDIO_MODULE_INDICATOR([fputs])
+  gl_STDIO_MODULE_INDICATOR([puts])
+  gl_STDIO_MODULE_INDICATOR([fwrite])
   gl_STDLIB_H
+  gl_STDLIB_H_REQUIRE_DEFAULTS
   if test $gl_cond_libtool = false; then
     gl_ltlibdeps="$gl_ltlibdeps $LTLIBICONV"
     gl_libdeps="$gl_libdeps $LIBICONV"
   fi
-  gl_HEADER_STRING_H
-  gl_HEADER_SYS_FILE_H
+  gl_STRING_H
+  gl_STRING_H_REQUIRE_DEFAULTS
+  gl_SYS_FILE_H
+  gl_SYS_FILE_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  AC_REQUIRE([gl_HEADER_SYS_SELECT])
+  gl_SYS_SELECT_H
+  gl_SYS_SELECT_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  gl_SYS_SOCKET_H
+  gl_SYS_SOCKET_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  gl_HEADER_SYS_STAT_H
+  gl_SYS_STAT_H
+  gl_SYS_STAT_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  gl_HEADER_SYS_TIME_H
+  gl_SYS_TIME_H
+  gl_SYS_TIME_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
   gl_SYS_TIMES_H
+  gl_SYS_TIMES_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
   gl_SYS_TYPES_H
+  gl_SYS_TYPES_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  gl_HEADER_SYS_UIO
+  gl_SYS_UIO_H
+  gl_SYS_UIO_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  gl_HEADER_TIME_H
+  gl_TIME_H
+  gl_TIME_H_REQUIRE_DEFAULTS
   gl_TIME_RZ
   if test $HAVE_TIMEZONE_T = 0; then
     AC_LIBOBJ([time_rz])
@@ -746,9 +794,11 @@ AC_DEFUN([gl_INIT],
   fi
   gl_MATH_MODULE_INDICATOR([trunc])
   gl_UNISTD_H
+  gl_UNISTD_H_REQUIRE_DEFAULTS
   gl_FUNC_VSNPRINTF
   gl_STDIO_MODULE_INDICATOR([vsnprintf])
   gl_WCHAR_H
+  gl_WCHAR_H_REQUIRE_DEFAULTS
   gl_FUNC_WRITE
   if test $REPLACE_WRITE = 1; then
     AC_LIBOBJ([write])
@@ -771,7 +821,6 @@ AC_DEFUN([gl_INIT],
   gl_gnulib_enabled_be453cec5eecf5731a274f2de7f2db36=false
   gl_gnulib_enabled_30838f5439487421042f2225bed3af76=false
   gl_gnulib_enabled_hostent=false
-  gl_gnulib_enabled_idx=false
   gl_gnulib_enabled_b1df7117b479d2da59d76deba468ee21=false
   gl_gnulib_enabled_3f0e593033d1fc2c127581960f641b66=false
   gl_gnulib_enabled_dbdf22868a5367f28bf18e0013ac6f8f=false
@@ -880,7 +929,9 @@ AC_SUBST([LTALLOCA])
   func_gl_gnulib_m4code_dynarray ()
   {
     if ! $gl_gnulib_enabled_dynarray; then
+      AC_PROG_MKDIR_P
       gl_gnulib_enabled_dynarray=true
+      func_gl_gnulib_m4code_37f71b604aa9c54446783d80f42fe547
       func_gl_gnulib_m4code_21ee726a3540c09237a8e70c0baf7467
     fi
   }
@@ -963,12 +1014,6 @@ AC_SUBST([LTALLOCA])
       gl_gnulib_enabled_hostent=true
     fi
   }
-  func_gl_gnulib_m4code_idx ()
-  {
-    if ! $gl_gnulib_enabled_idx; then
-      gl_gnulib_enabled_idx=true
-    fi
-  }
   func_gl_gnulib_m4code_b1df7117b479d2da59d76deba468ee21 ()
   {
     if ! $gl_gnulib_enabled_b1df7117b479d2da59d76deba468ee21; then
@@ -1181,7 +1226,6 @@ AC_SUBST([LTALLOCA])
         AC_LIBOBJ([realloc])
       fi
       gl_STDLIB_MODULE_INDICATOR([realloc-posix])
-      gl_MODULE_INDICATOR([realloc-posix])
       gl_gnulib_enabled_61bcaca76b3e6f9ae55d57a1c3193bc4=true
     fi
   }
@@ -1205,7 +1249,9 @@ AC_SUBST([LTALLOCA])
   func_gl_gnulib_m4code_scratch_buffer ()
   {
     if ! $gl_gnulib_enabled_scratch_buffer; then
+      AC_PROG_MKDIR_P
       gl_gnulib_enabled_scratch_buffer=true
+      func_gl_gnulib_m4code_37f71b604aa9c54446783d80f42fe547
       func_gl_gnulib_m4code_21ee726a3540c09237a8e70c0baf7467
       func_gl_gnulib_m4code_61bcaca76b3e6f9ae55d57a1c3193bc4
     fi
@@ -1319,7 +1365,8 @@ AC_SUBST([LTALLOCA])
   func_gl_gnulib_m4code_sys_random ()
   {
     if ! $gl_gnulib_enabled_sys_random; then
-      gl_HEADER_SYS_RANDOM
+      gl_SYS_RANDOM_H
+      gl_SYS_RANDOM_H_REQUIRE_DEFAULTS
       AC_PROG_MKDIR_P
       gl_gnulib_enabled_sys_random=true
     fi
@@ -1416,6 +1463,7 @@ AC_SUBST([LTALLOCA])
   {
     if ! $gl_gnulib_enabled_3dcce957eadc896e63ab5f137947b410; then
       gl_WCTYPE_H
+      gl_WCTYPE_H_REQUIRE_DEFAULTS
       gl_gnulib_enabled_3dcce957eadc896e63ab5f137947b410=true
     fi
   }
@@ -1430,9 +1478,6 @@ AC_SUBST([LTALLOCA])
   if test $HAVE_CANONICALIZE_FILE_NAME = 0 || test 
$REPLACE_CANONICALIZE_FILE_NAME = 1; then
     func_gl_gnulib_m4code_925677f0343de64b89a9f0c790b4104c
   fi
-  if test $HAVE_CANONICALIZE_FILE_NAME = 0 || test 
$REPLACE_CANONICALIZE_FILE_NAME = 1; then
-    func_gl_gnulib_m4code_idx
-  fi
   if test $HAVE_CANONICALIZE_FILE_NAME = 0 || test 
$REPLACE_CANONICALIZE_FILE_NAME = 1; then
     func_gl_gnulib_m4code_21ee726a3540c09237a8e70c0baf7467
   fi
@@ -1583,9 +1628,6 @@ AC_SUBST([LTALLOCA])
   if test "$ac_cv_header_winsock2_h" = yes; then
     func_gl_gnulib_m4code_sockets
   fi
-  if test $HAVE_TIMEZONE_T = 0; then
-    func_gl_gnulib_m4code_idx
-  fi
   if test $HAVE_TIMEZONE_T = 0; then
     func_gl_gnulib_m4code_time_r
   fi
@@ -1621,7 +1663,6 @@ AC_SUBST([LTALLOCA])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_be453cec5eecf5731a274f2de7f2db36], 
[$gl_gnulib_enabled_be453cec5eecf5731a274f2de7f2db36])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_30838f5439487421042f2225bed3af76], 
[$gl_gnulib_enabled_30838f5439487421042f2225bed3af76])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_hostent], [$gl_gnulib_enabled_hostent])
-  AM_CONDITIONAL([gl_GNULIB_ENABLED_idx], [$gl_gnulib_enabled_idx])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_b1df7117b479d2da59d76deba468ee21], 
[$gl_gnulib_enabled_b1df7117b479d2da59d76deba468ee21])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_3f0e593033d1fc2c127581960f641b66], 
[$gl_gnulib_enabled_3f0e593033d1fc2c127581960f641b66])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_dbdf22868a5367f28bf18e0013ac6f8f], 
[$gl_gnulib_enabled_dbdf22868a5367f28bf18e0013ac6f8f])
@@ -1673,6 +1714,8 @@ AC_SUBST([LTALLOCA])
       m4_if(m4_sysval, [0], [],
         [AC_FATAL([expected source file, required through AC_LIBSOURCES, not 
found])])
   ])
+  m4_popdef([GL_MODULE_INDICATOR_PREFIX])
+  m4_popdef([GL_MACRO_PREFIX])
   m4_popdef([gl_LIBSOURCES_DIR])
   m4_popdef([gl_LIBSOURCES_LIST])
   m4_popdef([AC_LIBSOURCES])
@@ -1699,6 +1742,8 @@ AC_SUBST([LTALLOCA])
   m4_pushdef([AC_LIBSOURCES], m4_defn([gltests_LIBSOURCES]))
   m4_pushdef([gltests_LIBSOURCES_LIST], [])
   m4_pushdef([gltests_LIBSOURCES_DIR], [])
+  m4_pushdef([GL_MACRO_PREFIX], [gltests])
+  m4_pushdef([GL_MODULE_INDICATOR_PREFIX], [GL])
   gl_COMMON
   gl_source_base='tests'
 changequote(,)dnl
@@ -1720,6 +1765,8 @@ changequote([, ])dnl
       m4_if(m4_sysval, [0], [],
         [AC_FATAL([expected source file, required through AC_LIBSOURCES, not 
found])])
   ])
+  m4_popdef([GL_MODULE_INDICATOR_PREFIX])
+  m4_popdef([GL_MACRO_PREFIX])
   m4_popdef([gltests_LIBSOURCES_DIR])
   m4_popdef([gltests_LIBSOURCES_LIST])
   m4_popdef([AC_LIBSOURCES])
@@ -2265,6 +2312,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/wint_t.m4
   m4/write.m4
   m4/xsize.m4
+  m4/year2038.m4
   m4/zzgnulib.m4
   top/GNUmakefile
   top/maint.mk
diff --git a/m4/hostent.m4 b/m4/hostent.m4
index 641d72fa3..f1390a32e 100644
--- a/m4/hostent.m4
+++ b/m4/hostent.m4
@@ -1,4 +1,4 @@
-# hostent.m4 serial 3
+# hostent.m4 serial 4
 dnl Copyright (C) 2008, 2010-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -13,7 +13,7 @@ AC_DEFUN([gl_HOSTENT],
   dnl - On BeOS, they are in libnet.
   dnl - On native Windows, they are in ws2_32.dll.
   dnl - Otherwise they are in libc.
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
+  AC_REQUIRE([gl_SYS_SOCKET_H])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
   HOSTENT_LIB=
   gl_saved_libs="$LIBS"
   AC_SEARCH_LIBS([gethostbyname], [nsl network net],
diff --git a/m4/iconv_h.m4 b/m4/iconv_h.m4
index ab8e2837a..294098829 100644
--- a/m4/iconv_h.m4
+++ b/m4/iconv_h.m4
@@ -1,10 +1,10 @@
-# iconv_h.m4 serial 12
+# iconv_h.m4 serial 15
 dnl Copyright (C) 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_ICONV_H],
+AC_DEFUN_ONCE([gl_ICONV_H],
 [
   AC_REQUIRE([gl_ICONV_H_DEFAULTS])
 
@@ -24,22 +24,37 @@ AC_DEFUN([gl_ICONV_H],
 dnl Unconditionally enables the replacement of <iconv.h>.
 AC_DEFUN([gl_REPLACE_ICONV_H],
 [
-  AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+  gl_ICONV_H_REQUIRE_DEFAULTS
   ICONV_H='iconv.h'
   AM_CONDITIONAL([GL_GENERATE_ICONV_H], [test -n "$ICONV_H"])
 ])
 
+# gl_ICONV_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_ICONV_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_ICONV_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_ICONV_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_ICONV_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ICONV])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_ICONV_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_ICONV_H_DEFAULTS],
 [
   m4_ifdef([gl_ANSI_CXX], [AC_REQUIRE([gl_ANSI_CXX])])
-  GNULIB_ICONV=0;       AC_SUBST([GNULIB_ICONV])
   dnl Assume proper GNU behavior unless another module says otherwise.
   ICONV_CONST=;         AC_SUBST([ICONV_CONST])
   REPLACE_ICONV=0;      AC_SUBST([REPLACE_ICONV])
diff --git a/m4/inttypes.m4 b/m4/inttypes.m4
index f56e94a88..64b1de5c4 100644
--- a/m4/inttypes.m4
+++ b/m4/inttypes.m4
@@ -1,4 +1,4 @@
-# inttypes.m4 serial 32
+# inttypes.m4 serial 35
 dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -7,7 +7,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 dnl From Derek Price, Bruno Haible.
 dnl Test whether <inttypes.h> is supported or must be substituted.
 
-AC_DEFUN([gl_INTTYPES_H],
+AC_DEFUN_ONCE([gl_INTTYPES_H],
 [
   AC_REQUIRE([gl_INTTYPES_INCOMPLETE])
   gl_INTTYPES_PRI_SCN
@@ -136,19 +136,34 @@ AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
   AC_SUBST([$1])
 ])
 
+# gl_INTTYPES_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_INTTYPES_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_INTTYPES_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_INTTYPES_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IMAXABS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IMAXDIV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOIMAX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOUMAX])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_INTTYPES_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
 [
-  GNULIB_IMAXABS=0;      AC_SUBST([GNULIB_IMAXABS])
-  GNULIB_IMAXDIV=0;      AC_SUBST([GNULIB_IMAXDIV])
-  GNULIB_STRTOIMAX=0;    AC_SUBST([GNULIB_STRTOIMAX])
-  GNULIB_STRTOUMAX=0;    AC_SUBST([GNULIB_STRTOUMAX])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_DECL_IMAXABS=1;   AC_SUBST([HAVE_DECL_IMAXABS])
   HAVE_DECL_IMAXDIV=1;   AC_SUBST([HAVE_DECL_IMAXDIV])
diff --git a/m4/langinfo_h.m4 b/m4/langinfo_h.m4
index 950fe20af..87959f77a 100644
--- a/m4/langinfo_h.m4
+++ b/m4/langinfo_h.m4
@@ -1,10 +1,10 @@
-# langinfo_h.m4 serial 9
+# langinfo_h.m4 serial 12
 dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_LANGINFO_H],
+AC_DEFUN_ONCE([gl_LANGINFO_H],
 [
   AC_REQUIRE([gl_LANGINFO_H_DEFAULTS])
 
@@ -104,18 +104,33 @@ int a = YESEXPR;
     ]], [nl_langinfo])
 ])
 
+# gl_LANGINFO_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_LANGINFO_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_LANGINFO_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_LANGINFO_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_LANGINFO_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_LANGINFO_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_NL_LANGINFO])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_LANGINFO_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_LANGINFO_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_LANGINFO_H_DEFAULTS],
 [
-  GNULIB_NL_LANGINFO=0;  AC_SUBST([GNULIB_NL_LANGINFO])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_NL_LANGINFO=1;    AC_SUBST([HAVE_NL_LANGINFO])
   REPLACE_NL_LANGINFO=0; AC_SUBST([REPLACE_NL_LANGINFO])
diff --git a/m4/largefile.m4 b/m4/largefile.m4
index cadb16dc9..fbde5e664 100644
--- a/m4/largefile.m4
+++ b/m4/largefile.m4
@@ -22,7 +22,8 @@ AC_DEFUN([gl_SET_LARGEFILE_SOURCE],
   esac
 ])
 
-# The following implementation works around a problem in autoconf <= 2.69;
+# Work around a problem in Autoconf through at least 2.71 on glibc 2.34+
+# with _TIME_BITS.  Also, work around a problem in autoconf <= 2.69:
 # AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5,
 # or configures them incorrectly in some cases.
 m4_version_prereq([2.70], [], [
@@ -40,6 +41,7 @@ m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
                        && LARGE_OFF_T % 2147483647 == 1)
                       ? 1 : -1]];[]dnl
 ])
+])# m4_version_prereq 2.70
 
 
 # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
@@ -54,7 +56,8 @@ m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
     [AC_LANG_PROGRAM([$5], [$6])],
     [$3=no; break])
   m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
-    [AC_LANG_PROGRAM([#define $1 $2
+    [AC_LANG_PROGRAM([#undef $1
+#define $1 $2
 $5], [$6])],
     [$3=$2; break])
   $3=unknown
@@ -80,9 +83,8 @@ rm -rf conftest*[]dnl
 AC_DEFUN([AC_SYS_LARGEFILE],
 [AC_ARG_ENABLE(largefile,
                [  --disable-largefile     omit support for large files])
-if test "$enable_largefile" != no; then
-
-  AC_CACHE_CHECK([for special C compiler options needed for large files],
+AS_IF([test "$enable_largefile" != no],
+ [AC_CACHE_CHECK([for special C compiler options needed for large files],
     ac_cv_sys_largefile_CC,
     [ac_cv_sys_largefile_CC=no
      if test "$GCC" != yes; then
@@ -107,15 +109,15 @@ if test "$enable_largefile" != no; then
     ac_cv_sys_file_offset_bits,
     [Number of bits in a file offset, on hosts where this is settable.],
     [_AC_SYS_LARGEFILE_TEST_INCLUDES])
-  if test $ac_cv_sys_file_offset_bits = unknown; then
-    _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
-      ac_cv_sys_large_files,
-      [Define for large files, on AIX-style hosts.],
-      [_AC_SYS_LARGEFILE_TEST_INCLUDES])
-  fi
-fi
+  AS_CASE([$ac_cv_sys_file_offset_bits],
+    [unknown],
+      [_AC_SYS_LARGEFILE_MACRO_VALUE([_LARGE_FILES], [1],
+         [ac_cv_sys_large_files],
+         [Define for large files, on AIX-style hosts.],
+         [_AC_SYS_LARGEFILE_TEST_INCLUDES])],
+    [64],
+      [gl_YEAR2038_BODY([])])])
 ])# AC_SYS_LARGEFILE
-])# m4_version_prereq 2.70
 
 # Enable large files on systems where this is implemented by Gnulib, not by the
 # system headers.
diff --git a/m4/limits-h.m4 b/m4/limits-h.m4
index 70dbb7dcf..00c9fe9e5 100644
--- a/m4/limits-h.m4
+++ b/m4/limits-h.m4
@@ -11,7 +11,7 @@ AC_DEFUN_ONCE([gl_LIMITS_H],
 [
   gl_CHECK_NEXT_HEADERS([limits.h])
 
-  AC_CACHE_CHECK([whether limits.h has LLONG_MAX, WORD_BIT, ULLONG_WIDTH etc.],
+  AC_CACHE_CHECK([whether limits.h has WORD_BIT, BOOL_WIDTH etc.],
     [gl_cv_header_limits_width],
     [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
@@ -22,6 +22,7 @@ AC_DEFUN_ONCE([gl_LIMITS_H],
             long long llm = LLONG_MAX;
             int wb = WORD_BIT;
             int ullw = ULLONG_WIDTH;
+            int bw = BOOL_WIDTH;
           ]])],
        [gl_cv_header_limits_width=yes],
        [gl_cv_header_limits_width=no])])
diff --git a/m4/locale_h.m4 b/m4/locale_h.m4
index 7b50aa7a8..444a38178 100644
--- a/m4/locale_h.m4
+++ b/m4/locale_h.m4
@@ -1,13 +1,13 @@
-# locale_h.m4 serial 25
+# locale_h.m4 serial 28
 dnl Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_LOCALE_H],
+AC_DEFUN_ONCE([gl_LOCALE_H],
 [
-  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
-  dnl once only, before all statements that occur in other macros.
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
   AC_REQUIRE([gl_LOCALE_H_DEFAULTS])
 
   dnl Persuade glibc <locale.h> to define locale_t and the int_p_*, int_n_*
@@ -129,22 +129,37 @@ AC_DEFUN([gl_LOCALE_T],
   AC_SUBST([HAVE_XLOCALE_H])
 ])
 
+# gl_LOCALE_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_LOCALE_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_LOCALE_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_LOCALE_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_LOCALE_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_LOCALE_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOCALECONV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SETLOCALE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SETLOCALE_NULL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_DUPLOCALE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOCALENAME])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_LOCALE_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_LOCALE_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_LOCALE_H_DEFAULTS],
 [
-  GNULIB_LOCALECONV=0;     AC_SUBST([GNULIB_LOCALECONV])
-  GNULIB_SETLOCALE=0;      AC_SUBST([GNULIB_SETLOCALE])
-  GNULIB_SETLOCALE_NULL=0; AC_SUBST([GNULIB_SETLOCALE_NULL])
-  GNULIB_DUPLOCALE=0;      AC_SUBST([GNULIB_DUPLOCALE])
-  GNULIB_LOCALENAME=0;     AC_SUBST([GNULIB_LOCALENAME])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_NEWLOCALE=1;       AC_SUBST([HAVE_NEWLOCALE])
   HAVE_DUPLOCALE=1;       AC_SUBST([HAVE_DUPLOCALE])
diff --git a/m4/malloc.m4 b/m4/malloc.m4
index 32ab42ec0..972e808ab 100644
--- a/m4/malloc.m4
+++ b/m4/malloc.m4
@@ -1,21 +1,21 @@
-# malloc.m4 serial 22
+# malloc.m4 serial 27
 dnl Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
 # This is adapted with modifications from upstream Autoconf here:
-# 
https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c
+# 
https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/functions.m4?id=v2.70#n949
 AC_DEFUN([_AC_FUNC_MALLOC_IF],
 [
   AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
-  AC_CACHE_CHECK([for GNU libc compatible malloc],
+  AC_CACHE_CHECK([whether malloc (0) returns nonnull],
     [ac_cv_func_malloc_0_nonnull],
     [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM(
           [[#include <stdlib.h>
           ]],
-          [[char *p = malloc (0);
+          [[void *p = malloc (0);
             int result = !p;
             free (p);
             return result;]])
@@ -24,75 +24,151 @@ AC_DEFUN([_AC_FUNC_MALLOC_IF],
        [ac_cv_func_malloc_0_nonnull=no],
        [case "$host_os" in
           # Guess yes on platforms where we know the result.
-          *-gnu* | gnu* | *-musl* | freebsd* | midnightbsd* | netbsd* | 
openbsd* \
-          | hpux* | solaris* | cygwin* | mingw*)
+          *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
+          | gnu* | *-musl* | midnightbsd* \
+          | hpux* | solaris* | cygwin* | mingw* | msys* )
             ac_cv_func_malloc_0_nonnull="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
           *) ac_cv_func_malloc_0_nonnull="$gl_cross_guess_normal" ;;
         esac
        ])
     ])
-  case "$ac_cv_func_malloc_0_nonnull" in
-    *yes)
-      $1
-      ;;
-    *)
-      $2
-      ;;
-  esac
+  AS_CASE([$ac_cv_func_malloc_0_nonnull], [*yes], [$1], [$2])
 ])# _AC_FUNC_MALLOC_IF
 
 # gl_FUNC_MALLOC_GNU
 # ------------------
-# Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if
-# it is not.
+# Replace malloc if it is not compatible with GNU libc.
 AC_DEFUN([gl_FUNC_MALLOC_GNU],
 [
   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
-  dnl _AC_FUNC_MALLOC_IF is defined in Autoconf.
-  _AC_FUNC_MALLOC_IF(
-    [AC_DEFINE([HAVE_MALLOC_GNU], [1],
-               [Define to 1 if your system has a GNU libc compatible 'malloc'
-                function, and to 0 otherwise.])],
-    [AC_DEFINE([HAVE_MALLOC_GNU], [0])
-     REPLACE_MALLOC=1
+  AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
+  if test $REPLACE_MALLOC = 0; then
+    _AC_FUNC_MALLOC_IF([], [REPLACE_MALLOC=1])
+  fi
+])
+
+# gl_FUNC_MALLOC_PTRDIFF
+# ----------------------
+# Test whether malloc (N) reliably fails when N exceeds PTRDIFF_MAX,
+# and replace malloc otherwise.
+AC_DEFUN([gl_FUNC_MALLOC_PTRDIFF],
+[
+  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+  AC_REQUIRE([gl_CHECK_MALLOC_PTRDIFF])
+  test "$gl_cv_malloc_ptrdiff" = yes || REPLACE_MALLOC=1
+])
+
+# Test whether malloc, realloc, calloc refuse to create objects
+# larger than what can be expressed in ptrdiff_t.
+# Set gl_cv_func_malloc_gnu to yes or no accordingly.
+AC_DEFUN([gl_CHECK_MALLOC_PTRDIFF],
+[
+  AC_CACHE_CHECK([whether malloc is ptrdiff_t safe],
+    [gl_cv_malloc_ptrdiff],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <stdint.h>
+          ]],
+          [[/* 64-bit ptrdiff_t is so wide that no practical platform
+               can exceed it.  */
+            #define WIDE_PTRDIFF (PTRDIFF_MAX >> 31 >> 31 != 0)
+
+            /* On rare machines where size_t fits in ptrdiff_t there
+               is no problem.  */
+            #define NARROW_SIZE (SIZE_MAX <= PTRDIFF_MAX)
+
+            /* glibc 2.30 and later malloc refuses to exceed ptrdiff_t
+               bounds even on 32-bit platforms.  We don't know which
+               non-glibc systems are safe.  */
+            #define KNOWN_SAFE (2 < __GLIBC__ + (30 <= __GLIBC_MINOR__))
+
+            #if WIDE_PTRDIFF || NARROW_SIZE || KNOWN_SAFE
+              return 0;
+            #else
+              #error "malloc might not be ptrdiff_t safe"
+              syntax error
+            #endif
+          ]])],
+       [gl_cv_malloc_ptrdiff=yes],
+       [gl_cv_malloc_ptrdiff=no])
     ])
 ])
 
 # gl_FUNC_MALLOC_POSIX
 # --------------------
 # Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it
-# fails), and replace malloc if it is not.
+# fails, and doesn't mess up with ptrdiff_t overflow), and replace
+# malloc if it is not.
 AC_DEFUN([gl_FUNC_MALLOC_POSIX],
 [
   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+  AC_REQUIRE([gl_FUNC_MALLOC_PTRDIFF])
   AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
-  if test $gl_cv_func_malloc_posix = yes; then
+  if test "$gl_cv_func_malloc_posix" = yes; then
     AC_DEFINE([HAVE_MALLOC_POSIX], [1],
-      [Define if the 'malloc' function is POSIX compliant.])
+      [Define if malloc, realloc, and calloc set errno on allocation failure.])
   else
     REPLACE_MALLOC=1
   fi
 ])
 
-# Test whether malloc, realloc, calloc are POSIX compliant,
+# Test whether malloc, realloc, calloc set errno to ENOMEM on failure.
 # Set gl_cv_func_malloc_posix to yes or no accordingly.
 AC_DEFUN([gl_CHECK_MALLOC_POSIX],
 [
-  AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant],
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_CACHE_CHECK([whether malloc, realloc, calloc set errno on failure],
     [gl_cv_func_malloc_posix],
     [
       dnl It is too dangerous to try to allocate a large amount of memory:
       dnl some systems go to their knees when you do that. So assume that
-      dnl all Unix implementations of the function are POSIX compliant.
-      AC_COMPILE_IFELSE(
-        [AC_LANG_PROGRAM(
-           [[]],
-           [[#if defined _WIN32 && ! defined __CYGWIN__
-             choke me
-             #endif
-            ]])],
-        [gl_cv_func_malloc_posix=yes],
-        [gl_cv_func_malloc_posix=no])
+      dnl all Unix implementations of the function set errno on failure,
+      dnl except on those platforms where we have seen 'test-malloc-gnu',
+      dnl 'test-realloc-gnu', 'test-calloc-gnu' fail.
+      case "$host_os" in
+        mingw*)
+          gl_cv_func_malloc_posix=no ;;
+        irix* | solaris*)
+          dnl On IRIX 6.5, the three functions return NULL with errno unset
+          dnl when the argument is larger than PTRDIFF_MAX.
+          dnl On Solaris 11.3, the three functions return NULL with errno set
+          dnl to EAGAIN, not ENOMEM, when the argument is larger than
+          dnl PTRDIFF_MAX.
+          dnl Here is a test program:
+m4_divert_push([KILL])
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#define ptrdiff_t long
+#ifndef PTRDIFF_MAX
+# define PTRDIFF_MAX ((ptrdiff_t) ((1UL << (8 * sizeof (ptrdiff_t) - 1)) - 1))
+#endif
+
+int main ()
+{
+  void *p;
+
+  fprintf (stderr, "PTRDIFF_MAX = %lu\n", (unsigned long) PTRDIFF_MAX);
+
+  errno = 0;
+  p = malloc ((unsigned long) PTRDIFF_MAX + 1);
+  fprintf (stderr, "p=%p errno=%d\n", p, errno);
+
+  errno = 0;
+  p = calloc (PTRDIFF_MAX / 2 + 1, 2);
+  fprintf (stderr, "p=%p errno=%d\n", p, errno);
+
+  errno = 0;
+  p = realloc (NULL, (unsigned long) PTRDIFF_MAX + 1);
+  fprintf (stderr, "p=%p errno=%d\n", p, errno);
+
+  return 0;
+}
+m4_divert_pop([KILL])
+          gl_cv_func_malloc_posix=no ;;
+        *)
+          gl_cv_func_malloc_posix=yes ;;
+      esac
     ])
 ])
diff --git a/m4/math_h.m4 b/m4/math_h.m4
index a9ba5e655..b3a10c3fb 100644
--- a/m4/math_h.m4
+++ b/m4/math_h.m4
@@ -1,10 +1,10 @@
-# math_h.m4 serial 122
+# math_h.m4 serial 125
 dnl Copyright (C) 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_MATH_H],
+AC_DEFUN_ONCE([gl_MATH_H],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   gl_CHECK_NEXT_HEADERS([math.h])
@@ -53,119 +53,134 @@ AC_DEFUN([gl_MATH_H],
      tanf tanl tanhf trunc truncf truncl])
 ])
 
+# gl_MATH_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_MATH_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_MATH_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_MATH_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_MATH_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACOSF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACOSL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ASINF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ASINL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ATANF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ATANL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ATAN2F])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CBRT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CBRTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CBRTL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CEIL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CEILF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CEILL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_COPYSIGN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_COPYSIGNF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_COPYSIGNL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_COSF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_COSL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_COSHF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXPF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXPL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXP2])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXP2F])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXP2L])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXPM1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXPM1F])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXPM1L])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FABSF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FABSL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FLOOR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FLOORF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FLOORL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FMA])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FMAF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FMAL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FMOD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FMODF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FMODL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FREXPF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FREXP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FREXPL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_HYPOT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_HYPOTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_HYPOTL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ILOGB])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ILOGBF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ILOGBL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISFINITE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISINF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISNAN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISNANF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISNAND])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISNANL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LDEXPF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LDEXPL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOGF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOGL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG10])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG10F])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG10L])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG1P])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG1PF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG1PL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG2])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG2F])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOG2L])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOGB])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOGBF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOGBL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MODF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MODFF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MODFL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_POWF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REMAINDER])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REMAINDERF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REMAINDERL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RINT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RINTL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ROUND])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ROUNDF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ROUNDL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGNBIT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SINF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SINL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SINHF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SQRTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SQRTL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TANF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TANL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TANHF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TRUNC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TRUNCF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TRUNCL])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_J0], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_J1], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_JN], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_Y0], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_Y1], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_YN], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_MATH_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_MATH_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_MATH_H_DEFAULTS],
 [
-  GNULIB_ACOSF=0;      AC_SUBST([GNULIB_ACOSF])
-  GNULIB_ACOSL=0;      AC_SUBST([GNULIB_ACOSL])
-  GNULIB_ASINF=0;      AC_SUBST([GNULIB_ASINF])
-  GNULIB_ASINL=0;      AC_SUBST([GNULIB_ASINL])
-  GNULIB_ATANF=0;      AC_SUBST([GNULIB_ATANF])
-  GNULIB_ATANL=0;      AC_SUBST([GNULIB_ATANL])
-  GNULIB_ATAN2F=0;     AC_SUBST([GNULIB_ATAN2F])
-  GNULIB_CBRT=0;       AC_SUBST([GNULIB_CBRT])
-  GNULIB_CBRTF=0;      AC_SUBST([GNULIB_CBRTF])
-  GNULIB_CBRTL=0;      AC_SUBST([GNULIB_CBRTL])
-  GNULIB_CEIL=0;       AC_SUBST([GNULIB_CEIL])
-  GNULIB_CEILF=0;      AC_SUBST([GNULIB_CEILF])
-  GNULIB_CEILL=0;      AC_SUBST([GNULIB_CEILL])
-  GNULIB_COPYSIGN=0;   AC_SUBST([GNULIB_COPYSIGN])
-  GNULIB_COPYSIGNF=0;  AC_SUBST([GNULIB_COPYSIGNF])
-  GNULIB_COPYSIGNL=0;  AC_SUBST([GNULIB_COPYSIGNL])
-  GNULIB_COSF=0;       AC_SUBST([GNULIB_COSF])
-  GNULIB_COSL=0;       AC_SUBST([GNULIB_COSL])
-  GNULIB_COSHF=0;      AC_SUBST([GNULIB_COSHF])
-  GNULIB_EXPF=0;       AC_SUBST([GNULIB_EXPF])
-  GNULIB_EXPL=0;       AC_SUBST([GNULIB_EXPL])
-  GNULIB_EXP2=0;       AC_SUBST([GNULIB_EXP2])
-  GNULIB_EXP2F=0;      AC_SUBST([GNULIB_EXP2F])
-  GNULIB_EXP2L=0;      AC_SUBST([GNULIB_EXP2L])
-  GNULIB_EXPM1=0;      AC_SUBST([GNULIB_EXPM1])
-  GNULIB_EXPM1F=0;     AC_SUBST([GNULIB_EXPM1F])
-  GNULIB_EXPM1L=0;     AC_SUBST([GNULIB_EXPM1L])
-  GNULIB_FABSF=0;      AC_SUBST([GNULIB_FABSF])
-  GNULIB_FABSL=0;      AC_SUBST([GNULIB_FABSL])
-  GNULIB_FLOOR=0;      AC_SUBST([GNULIB_FLOOR])
-  GNULIB_FLOORF=0;     AC_SUBST([GNULIB_FLOORF])
-  GNULIB_FLOORL=0;     AC_SUBST([GNULIB_FLOORL])
-  GNULIB_FMA=0;        AC_SUBST([GNULIB_FMA])
-  GNULIB_FMAF=0;       AC_SUBST([GNULIB_FMAF])
-  GNULIB_FMAL=0;       AC_SUBST([GNULIB_FMAL])
-  GNULIB_FMOD=0;       AC_SUBST([GNULIB_FMOD])
-  GNULIB_FMODF=0;      AC_SUBST([GNULIB_FMODF])
-  GNULIB_FMODL=0;      AC_SUBST([GNULIB_FMODL])
-  GNULIB_FREXPF=0;     AC_SUBST([GNULIB_FREXPF])
-  GNULIB_FREXP=0;      AC_SUBST([GNULIB_FREXP])
-  GNULIB_FREXPL=0;     AC_SUBST([GNULIB_FREXPL])
-  GNULIB_HYPOT=0;      AC_SUBST([GNULIB_HYPOT])
-  GNULIB_HYPOTF=0;     AC_SUBST([GNULIB_HYPOTF])
-  GNULIB_HYPOTL=0;     AC_SUBST([GNULIB_HYPOTL])
-  GNULIB_ILOGB=0;      AC_SUBST([GNULIB_ILOGB])
-  GNULIB_ILOGBF=0;     AC_SUBST([GNULIB_ILOGBF])
-  GNULIB_ILOGBL=0;     AC_SUBST([GNULIB_ILOGBL])
-  GNULIB_ISFINITE=0;   AC_SUBST([GNULIB_ISFINITE])
-  GNULIB_ISINF=0;      AC_SUBST([GNULIB_ISINF])
-  GNULIB_ISNAN=0;      AC_SUBST([GNULIB_ISNAN])
-  GNULIB_ISNANF=0;     AC_SUBST([GNULIB_ISNANF])
-  GNULIB_ISNAND=0;     AC_SUBST([GNULIB_ISNAND])
-  GNULIB_ISNANL=0;     AC_SUBST([GNULIB_ISNANL])
-  GNULIB_LDEXPF=0;     AC_SUBST([GNULIB_LDEXPF])
-  GNULIB_LDEXPL=0;     AC_SUBST([GNULIB_LDEXPL])
-  GNULIB_LOG=0;        AC_SUBST([GNULIB_LOG])
-  GNULIB_LOGF=0;       AC_SUBST([GNULIB_LOGF])
-  GNULIB_LOGL=0;       AC_SUBST([GNULIB_LOGL])
-  GNULIB_LOG10=0;      AC_SUBST([GNULIB_LOG10])
-  GNULIB_LOG10F=0;     AC_SUBST([GNULIB_LOG10F])
-  GNULIB_LOG10L=0;     AC_SUBST([GNULIB_LOG10L])
-  GNULIB_LOG1P=0;      AC_SUBST([GNULIB_LOG1P])
-  GNULIB_LOG1PF=0;     AC_SUBST([GNULIB_LOG1PF])
-  GNULIB_LOG1PL=0;     AC_SUBST([GNULIB_LOG1PL])
-  GNULIB_LOG2=0;       AC_SUBST([GNULIB_LOG2])
-  GNULIB_LOG2F=0;      AC_SUBST([GNULIB_LOG2F])
-  GNULIB_LOG2L=0;      AC_SUBST([GNULIB_LOG2L])
-  GNULIB_LOGB=0;       AC_SUBST([GNULIB_LOGB])
-  GNULIB_LOGBF=0;      AC_SUBST([GNULIB_LOGBF])
-  GNULIB_LOGBL=0;      AC_SUBST([GNULIB_LOGBL])
-  GNULIB_MODF=0;       AC_SUBST([GNULIB_MODF])
-  GNULIB_MODFF=0;      AC_SUBST([GNULIB_MODFF])
-  GNULIB_MODFL=0;      AC_SUBST([GNULIB_MODFL])
-  GNULIB_POWF=0;       AC_SUBST([GNULIB_POWF])
-  GNULIB_REMAINDER=0;  AC_SUBST([GNULIB_REMAINDER])
-  GNULIB_REMAINDERF=0; AC_SUBST([GNULIB_REMAINDERF])
-  GNULIB_REMAINDERL=0; AC_SUBST([GNULIB_REMAINDERL])
-  GNULIB_RINT=0;       AC_SUBST([GNULIB_RINT])
-  GNULIB_RINTF=0;      AC_SUBST([GNULIB_RINTF])
-  GNULIB_RINTL=0;      AC_SUBST([GNULIB_RINTL])
-  GNULIB_ROUND=0;      AC_SUBST([GNULIB_ROUND])
-  GNULIB_ROUNDF=0;     AC_SUBST([GNULIB_ROUNDF])
-  GNULIB_ROUNDL=0;     AC_SUBST([GNULIB_ROUNDL])
-  GNULIB_SIGNBIT=0;    AC_SUBST([GNULIB_SIGNBIT])
-  GNULIB_SINF=0;       AC_SUBST([GNULIB_SINF])
-  GNULIB_SINL=0;       AC_SUBST([GNULIB_SINL])
-  GNULIB_SINHF=0;      AC_SUBST([GNULIB_SINHF])
-  GNULIB_SQRTF=0;      AC_SUBST([GNULIB_SQRTF])
-  GNULIB_SQRTL=0;      AC_SUBST([GNULIB_SQRTL])
-  GNULIB_TANF=0;       AC_SUBST([GNULIB_TANF])
-  GNULIB_TANL=0;       AC_SUBST([GNULIB_TANL])
-  GNULIB_TANHF=0;      AC_SUBST([GNULIB_TANHF])
-  GNULIB_TRUNC=0;      AC_SUBST([GNULIB_TRUNC])
-  GNULIB_TRUNCF=0;     AC_SUBST([GNULIB_TRUNCF])
-  GNULIB_TRUNCL=0;     AC_SUBST([GNULIB_TRUNCL])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_J0=1;     AC_SUBST([GNULIB_MDA_J0])
-  GNULIB_MDA_J1=1;     AC_SUBST([GNULIB_MDA_J1])
-  GNULIB_MDA_JN=1;     AC_SUBST([GNULIB_MDA_JN])
-  GNULIB_MDA_Y0=1;     AC_SUBST([GNULIB_MDA_Y0])
-  GNULIB_MDA_Y1=1;     AC_SUBST([GNULIB_MDA_Y1])
-  GNULIB_MDA_YN=1;     AC_SUBST([GNULIB_MDA_YN])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_ACOSF=1;                     AC_SUBST([HAVE_ACOSF])
   HAVE_ACOSL=1;                     AC_SUBST([HAVE_ACOSL])
diff --git a/m4/memchr.m4 b/m4/memchr.m4
index 64470ded5..ca08192a6 100644
--- a/m4/memchr.m4
+++ b/m4/memchr.m4
@@ -1,4 +1,4 @@
-# memchr.m4 serial 17
+# memchr.m4 serial 18
 dnl Copyright (C) 2002-2004, 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -13,7 +13,7 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
   AC_CHECK_HEADERS_ONCE([sys/mman.h])
   AC_CHECK_FUNCS_ONCE([mprotect])
 
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
   # Detect platform-specific bugs in some versions of glibc:
   # memchr should not dereference anything with length 0
   #   https://bugzilla.redhat.com/show_bug.cgi?id=499689
diff --git a/m4/mempcpy.m4 b/m4/mempcpy.m4
index c5ee2af8c..f9d9ec8f3 100644
--- a/m4/mempcpy.m4
+++ b/m4/mempcpy.m4
@@ -1,4 +1,4 @@
-# mempcpy.m4 serial 11
+# mempcpy.m4 serial 12
 dnl Copyright (C) 2003-2004, 2006-2007, 2009-2021 Free Software Foundation,
 dnl Inc.
 dnl This file is free software; the Free Software Foundation
@@ -13,7 +13,7 @@ AC_DEFUN([gl_FUNC_MEMPCPY],
   dnl The mempcpy() declaration in lib/string.in.h uses 'restrict'.
   AC_REQUIRE([AC_C_RESTRICT])
 
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
   AC_CHECK_FUNCS([mempcpy])
   if test $ac_cv_func_mempcpy = no; then
     HAVE_MEMPCPY=0
diff --git a/m4/mktime.m4 b/m4/mktime.m4
index 245649e77..721189af5 100644
--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -1,4 +1,4 @@
-# serial 35
+# serial 36
 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2021 Free Software Foundation,
 dnl Inc.
 dnl This file is free software; the Free Software Foundation
@@ -255,7 +255,7 @@ main ()
 dnl Main macro of module 'mktime'.
 AC_DEFUN([gl_FUNC_MKTIME],
 [
-  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  AC_REQUIRE([gl_TIME_H_DEFAULTS])
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_REQUIRE([gl_FUNC_MKTIME_WORKS])
 
diff --git a/m4/netdb_h.m4 b/m4/netdb_h.m4
index db84c787e..eb7c3b8b5 100644
--- a/m4/netdb_h.m4
+++ b/m4/netdb_h.m4
@@ -1,10 +1,10 @@
-# netdb_h.m4 serial 12
+# netdb_h.m4 serial 15
 dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_HEADER_NETDB],
+AC_DEFUN_ONCE([gl_NETDB_H],
 [
   AC_REQUIRE([gl_NETDB_H_DEFAULTS])
   gl_CHECK_NEXT_HEADERS([netdb.h])
@@ -21,18 +21,33 @@ AC_DEFUN([gl_HEADER_NETDB],
     [getaddrinfo freeaddrinfo gai_strerror getnameinfo])
 ])
 
+# gl_NETDB_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_NETDB_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_NETDB_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_NETDB_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_NETDB_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_NETDB_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETADDRINFO])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_NETDB_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_NETDB_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_NETDB_H_DEFAULTS],
 [
-  GNULIB_GETADDRINFO=0; AC_SUBST([GNULIB_GETADDRINFO])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_STRUCT_ADDRINFO=1;   AC_SUBST([HAVE_STRUCT_ADDRINFO])
   HAVE_DECL_FREEADDRINFO=1; AC_SUBST([HAVE_DECL_FREEADDRINFO])
diff --git a/m4/poll_h.m4 b/m4/poll_h.m4
index 20692d866..1f0d7964a 100644
--- a/m4/poll_h.m4
+++ b/m4/poll_h.m4
@@ -1,4 +1,4 @@
-# poll_h.m4 serial 3
+# poll_h.m4 serial 6
 dnl Copyright (C) 2010-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,10 +6,10 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl Written by Bruno Haible.
 
-AC_DEFUN([gl_POLL_H],
+AC_DEFUN_ONCE([gl_POLL_H],
 [
-  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
-  dnl once only, before all statements that occur in other macros.
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
   AC_REQUIRE([gl_POLL_H_DEFAULTS])
 
   AC_CHECK_HEADERS_ONCE([poll.h])
@@ -31,18 +31,33 @@ AC_DEFUN([gl_POLL_H],
     [poll])
 ])
 
+# gl_POLL_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_POLL_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_POLL_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_POLL_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_POLL_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_POLL_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_POLL])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_POLL_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_POLL_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_POLL_H_DEFAULTS],
 [
-  GNULIB_POLL=0;        AC_SUBST([GNULIB_POLL])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_POLL=1;          AC_SUBST([HAVE_POLL])
   REPLACE_POLL=0;       AC_SUBST([REPLACE_POLL])
diff --git a/m4/printf.m4 b/m4/printf.m4
index d8b352104..284c7c5d3 100644
--- a/m4/printf.m4
+++ b/m4/printf.m4
@@ -1,4 +1,4 @@
-# printf.m4 serial 72
+# printf.m4 serial 73
 dnl Copyright (C) 2003, 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -537,7 +537,7 @@ int main ()
           && strcmp (buf, "-0X6.488P-1 33") != 0
           && strcmp (buf, "-0XC.91P-2 33") != 0))
     result |= 2;
-  /* This catches a FreeBSD 6.1 bug: it doesn't round.  */
+  /* This catches a FreeBSD 13.0 bug: it doesn't round.  */
   if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
       || (strcmp (buf, "0x1.83p+0 33") != 0
           && strcmp (buf, "0x3.05p-1 33") != 0
@@ -1690,6 +1690,7 @@ dnl
 dnl                                  1  2  3  4  5  6  7  8  9 10 11 12 13 14 
15 16 17 18 19 20
 dnl   glibc 2.5                      .  .  .  .  .  .  .  .  .  .  .  .  .  .  
.  .  .  .  .  .
 dnl   glibc 2.3.6                    .  .  .  .  #  .  .  .  .  .  .  .  .  .  
.  .  .  .  .  .
+dnl   FreeBSD 13.0                   .  .  .  .  #  .  .  .  .  .  .  .  .  #  
.  .  .  .  .  .
 dnl   FreeBSD 5.4, 6.1               .  .  .  .  #  .  .  .  .  .  .  #  .  #  
.  .  .  .  .  .
 dnl   Mac OS X 10.13.5               .  .  .  #  #  .  #  .  .  .  .  .  .  .  
.  .  .  #  .  .
 dnl   Mac OS X 10.5.8                .  .  .  #  #  .  .  .  .  .  .  #  .  .  
.  .  .  .  .  .
diff --git a/m4/rawmemchr.m4 b/m4/rawmemchr.m4
index f92846543..452fab18f 100644
--- a/m4/rawmemchr.m4
+++ b/m4/rawmemchr.m4
@@ -1,4 +1,4 @@
-# rawmemchr.m4 serial 2
+# rawmemchr.m4 serial 3
 dnl Copyright (C) 2003, 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -9,7 +9,7 @@ AC_DEFUN([gl_FUNC_RAWMEMCHR],
   dnl Persuade glibc <string.h> to declare rawmemchr().
   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
   AC_CHECK_FUNCS([rawmemchr])
   if test $ac_cv_func_rawmemchr = no; then
     HAVE_RAWMEMCHR=0
diff --git a/m4/realloc.m4 b/m4/realloc.m4
index a80a02a6b..0abc4185e 100644
--- a/m4/realloc.m4
+++ b/m4/realloc.m4
@@ -1,21 +1,21 @@
-# realloc.m4 serial 20
+# realloc.m4 serial 24
 dnl Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
 # This is adapted with modifications from upstream Autoconf here:
-# 
https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c
+# 
https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/functions.m4?id=v2.70#n1455
 AC_DEFUN([_AC_FUNC_REALLOC_IF],
 [
   AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
-  AC_CACHE_CHECK([for GNU libc compatible realloc],
+  AC_CACHE_CHECK([whether realloc (0, 0) returns nonnull],
     [ac_cv_func_realloc_0_nonnull],
     [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM(
           [[#include <stdlib.h>
           ]],
-          [[char *p = realloc (0, 0);
+          [[void *p = realloc (0, 0);
             int result = !p;
             free (p);
             return result;]])
@@ -24,53 +24,40 @@ AC_DEFUN([_AC_FUNC_REALLOC_IF],
        [ac_cv_func_realloc_0_nonnull=no],
        [case "$host_os" in
           # Guess yes on platforms where we know the result.
-          *-gnu* | gnu* | *-musl* | freebsd* | midnightbsd* | netbsd* | 
openbsd* \
-          | hpux* | solaris* | cygwin* | mingw*)
+          *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
+          | gnu* | *-musl* | midnightbsd* \
+          | hpux* | solaris* | cygwin* | mingw* | msys* )
             ac_cv_func_realloc_0_nonnull="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
           *) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;;
         esac
        ])
     ])
-  case "$ac_cv_func_realloc_0_nonnull" in
-    *yes)
-      $1
-      ;;
-    *)
-      $2
-      ;;
-  esac
+  AS_CASE([$ac_cv_func_realloc_0_nonnull], [*yes], [$1], [$2])
 ])# AC_FUNC_REALLOC
 
 # gl_FUNC_REALLOC_GNU
 # -------------------
-# Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace
-# realloc if it is not.
+# Replace realloc if it is not compatible with GNU libc.
 AC_DEFUN([gl_FUNC_REALLOC_GNU],
 [
   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
-  dnl _AC_FUNC_REALLOC_IF is defined in Autoconf.
-  _AC_FUNC_REALLOC_IF(
-    [AC_DEFINE([HAVE_REALLOC_GNU], [1],
-               [Define to 1 if your system has a GNU libc compatible 'realloc'
-                function, and to 0 otherwise.])],
-    [AC_DEFINE([HAVE_REALLOC_GNU], [0])
-     REPLACE_REALLOC=1
-    ])
+  AC_REQUIRE([gl_FUNC_REALLOC_POSIX])
+  if test $REPLACE_REALLOC = 0; then
+    _AC_FUNC_REALLOC_IF([], [REPLACE_REALLOC=1])
+  fi
 ])# gl_FUNC_REALLOC_GNU
 
 # gl_FUNC_REALLOC_POSIX
 # ---------------------
 # Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
-# fails), and replace realloc if it is not.
+# fails, and doesn't mess up with ptrdiff_t overflow),
+# and replace realloc if it is not.
 AC_DEFUN([gl_FUNC_REALLOC_POSIX],
 [
   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
-  AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
-  if test $gl_cv_func_malloc_posix = yes; then
-    AC_DEFINE([HAVE_REALLOC_POSIX], [1],
-      [Define if the 'realloc' function is POSIX compliant.])
-  else
+  AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
+  if test $REPLACE_MALLOC = 1; then
     REPLACE_REALLOC=1
   fi
 ])
diff --git a/m4/regex.m4 b/m4/regex.m4
index 850c57222..1c7e562f6 100644
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,4 +1,4 @@
-# serial 71
+# serial 73
 
 # Copyright (C) 1996-2001, 2003-2021 Free Software Foundation, Inc.
 #
@@ -246,7 +246,7 @@ AC_DEFUN([gl_REGEX],
                            & ~RE_CONTEXT_INVALID_DUP
                            & ~RE_NO_EMPTY_RANGES);
             memset (&regex, 0, sizeof regex);
-            s = re_compile_pattern ("[[:alnum:]_-]\\\\+$", 16, &regex);
+            s = re_compile_pattern ("[[:alnum:]_-]\\\\+\$", 16, &regex);
             if (s)
               result |= 32;
             else
@@ -264,14 +264,50 @@ AC_DEFUN([gl_REGEX],
                back reference.  */
             re_set_syntax (RE_SYNTAX_POSIX_EGREP);
             memset (&regex, 0, sizeof regex);
-            s = re_compile_pattern ("0|()0|\\1|0", 10, &regex);
+            s = re_compile_pattern ("0|()0|\\\\1|0", 10, &regex);
             if (!s)
-              result |= 64;
+              {
+                memset (&regs, 0, sizeof regs);
+                i = re_search (&regex, "x", 1, 0, 1, &regs);
+                if (i != -1)
+                  result |= 64;
+                if (0 <= i)
+                  {
+                    free (regs.start);
+                    free (regs.end);
+                  }
+                regfree (&regex);
+              }
             else
               {
                 if (strcmp (s, "Invalid back reference"))
                   result |= 64;
+              }
+
+            /* glibc bug 11053.  */
+            re_set_syntax (RE_SYNTAX_POSIX_BASIC);
+            memset (&regex, 0, sizeof regex);
+            static char const pat_sub2[] = "\\\\(a*\\\\)*a*\\\\1";
+            s = re_compile_pattern (pat_sub2, sizeof pat_sub2 - 1, &regex);
+            if (s)
+              result |= 64;
+            else
+              {
+                memset (&regs, 0, sizeof regs);
+                static char const data[] = "a";
+                int datalen = sizeof data - 1;
+                i = re_search (&regex, data, datalen, 0, datalen, &regs);
+                if (i != 0)
+                  result |= 64;
+                else if (regs.num_regs < 2)
+                  result |= 64;
+                else if (! (regs.start[0] == 0 && regs.end[0] == 1))
+                  result |= 64;
+                else if (! (regs.start[1] == 0 && regs.end[1] == 0))
+                  result |= 64;
                 regfree (&regex);
+                free (regs.start);
+                free (regs.end);
               }
 
 #if 0
diff --git a/m4/select.m4 b/m4/select.m4
index c7409d204..72c068fa4 100644
--- a/m4/select.m4
+++ b/m4/select.m4
@@ -1,4 +1,4 @@
-# select.m4 serial 12
+# select.m4 serial 13
 dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN([gl_FUNC_SELECT],
 [
-  AC_REQUIRE([gl_HEADER_SYS_SELECT])
+  AC_REQUIRE([gl_SYS_SELECT_H])
   AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_REQUIRE([gl_SOCKETS])
diff --git a/m4/servent.m4 b/m4/servent.m4
index 2dda17750..9bc3bcd4f 100644
--- a/m4/servent.m4
+++ b/m4/servent.m4
@@ -1,4 +1,4 @@
-# servent.m4 serial 3
+# servent.m4 serial 4
 dnl Copyright (C) 2008, 2010-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -15,7 +15,7 @@ AC_DEFUN([gl_SERVENT],
   dnl - On BeOS, they are in libnet.
   dnl - On native Windows, they are in ws2_32.dll.
   dnl - Otherwise they are in libc.
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
+  AC_REQUIRE([gl_SYS_SOCKET_H])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
   SERVENT_LIB=
   gl_saved_libs="$LIBS"
   AC_SEARCH_LIBS([getservbyname], [socket network net],
diff --git a/m4/signal_h.m4 b/m4/signal_h.m4
index ff9f0251f..8b938809b 100644
--- a/m4/signal_h.m4
+++ b/m4/signal_h.m4
@@ -1,10 +1,10 @@
-# signal_h.m4 serial 19
+# signal_h.m4 serial 22
 dnl Copyright (C) 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_SIGNAL_H],
+AC_DEFUN_ONCE([gl_SIGNAL_H],
 [
   AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
   AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
@@ -52,22 +52,37 @@ AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
   fi
 ])
 
+# gl_SIGNAL_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SIGNAL_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SIGNAL_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTHREAD_SIGMASK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RAISE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGNAL_H_SIGPIPE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGPROCMASK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGACTION])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
 [
-  GNULIB_PTHREAD_SIGMASK=0;    AC_SUBST([GNULIB_PTHREAD_SIGMASK])
-  GNULIB_RAISE=0;              AC_SUBST([GNULIB_RAISE])
-  GNULIB_SIGNAL_H_SIGPIPE=0;   AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
-  GNULIB_SIGPROCMASK=0;        AC_SUBST([GNULIB_SIGPROCMASK])
-  GNULIB_SIGACTION=0;          AC_SUBST([GNULIB_SIGACTION])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
   HAVE_PTHREAD_SIGMASK=1;      AC_SUBST([HAVE_PTHREAD_SIGMASK])
diff --git a/m4/sockpfaf.m4 b/m4/sockpfaf.m4
index edae5d85c..17e14c7a6 100644
--- a/m4/sockpfaf.m4
+++ b/m4/sockpfaf.m4
@@ -1,4 +1,4 @@
-# sockpfaf.m4 serial 9
+# sockpfaf.m4 serial 10
 dnl Copyright (C) 2004, 2006, 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -13,7 +13,7 @@ dnl From Bruno Haible.
 
 AC_DEFUN([gl_SOCKET_FAMILIES],
 [
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   AC_CHECK_HEADERS_ONCE([netinet/in.h])
 
   AC_CACHE_CHECK([for IPv4 sockets],
@@ -60,7 +60,7 @@ AC_DEFUN([gl_SOCKET_FAMILIES],
 
 AC_DEFUN([gl_SOCKET_FAMILY_UNIX],
 [
-  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SOCKET_H])
   AC_CHECK_HEADERS_ONCE([sys/un.h])
 
   AC_CACHE_CHECK([for UNIX domain sockets],
diff --git a/m4/stat.m4 b/m4/stat.m4
index 66f6c8c5c..9bcdb72d6 100644
--- a/m4/stat.m4
+++ b/m4/stat.m4
@@ -1,4 +1,4 @@
-# serial 17
+# serial 18
 
 # Copyright (C) 2009-2021 Free Software Foundation, Inc.
 #
@@ -69,7 +69,7 @@ AC_DEFUN([gl_FUNC_STAT],
 
 # Prerequisites of lib/stat.c and lib/stat-w32.c.
 AC_DEFUN([gl_PREREQ_STAT], [
-  AC_REQUIRE([gl_HEADER_SYS_STAT_H])
+  AC_REQUIRE([gl_SYS_STAT_H])
   AC_REQUIRE([gl_PREREQ_STAT_W32])
   :
 ])
diff --git a/m4/stddef_h.m4 b/m4/stddef_h.m4
index cd666c4a5..1303d2e06 100644
--- a/m4/stddef_h.m4
+++ b/m4/stddef_h.m4
@@ -1,4 +1,4 @@
-# stddef_h.m4 serial 9
+# stddef_h.m4 serial 11
 dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl A placeholder for <stddef.h>, for platforms that have issues.
 
-AC_DEFUN([gl_STDDEF_H],
+AC_DEFUN_ONCE([gl_STDDEF_H],
 [
   AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
   AC_REQUIRE([gt_TYPE_WCHAR_T])
@@ -68,13 +68,28 @@ AC_DEFUN([gl_STDDEF_H],
   fi
 ])
 
+# gl_STDDEF_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_STDDEF_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_STDDEF_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_STDDEF_H_MODULE_INDICATOR_DEFAULTS], [
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_STDDEF_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_STDDEF_H_DEFAULTS],
 [
   dnl Assume proper GNU behavior unless another module says otherwise.
diff --git a/m4/stdint.m4 b/m4/stdint.m4
index a785b44ed..2eb1652d8 100644
--- a/m4/stdint.m4
+++ b/m4/stdint.m4
@@ -1,4 +1,4 @@
-# stdint.m4 serial 58
+# stdint.m4 serial 60
 dnl Copyright (C) 2001-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -170,7 +170,7 @@ struct s {
       PTRDIFF_MIN == TYPE_MINIMUM (ptrdiff_t)
       && PTRDIFF_MAX == TYPE_MAXIMUM (ptrdiff_t)
       ? 1 : -1;
-  /* Detect bug in FreeBSD 6.0 / ia64.  */
+  /* Detect bug in FreeBSD 6.0/ia64 and FreeBSD 13.0/arm64.  */
   int check_SIG_ATOMIC:
       SIG_ATOMIC_MIN == TYPE_MINIMUM (sig_atomic_t)
       && SIG_ATOMIC_MAX == TYPE_MAXIMUM (sig_atomic_t)
@@ -527,7 +527,7 @@ AC_DEFUN([gl_STDINT_TYPE_PROPERTIES],
   dnl requirement that wint_t is "unchanged by default argument promotions".
   dnl In this case gnulib's <wchar.h> and <wctype.h> override wint_t.
   dnl Set the variable BITSIZEOF_WINT_T accordingly.
-  if test $GNULIB_OVERRIDES_WINT_T = 1; then
+  if test $GNULIBHEADERS_OVERRIDE_WINT_T = 1; then
     BITSIZEOF_WINT_T=32
   fi
 ])
diff --git a/m4/stdio_h.m4 b/m4/stdio_h.m4
index 4c3f24acc..e70438386 100644
--- a/m4/stdio_h.m4
+++ b/m4/stdio_h.m4
@@ -1,11 +1,12 @@
-# stdio_h.m4 serial 52
+# stdio_h.m4 serial 56
 dnl Copyright (C) 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_STDIO_H],
+AC_DEFUN_ONCE([gl_STDIO_H],
 [
+  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   AH_VERBATIM([MINGW_ANSI_STDIO],
 [/* Use GNU style printf and scanf.  */
 #ifndef __USE_MINGW_ANSI_STDIO
@@ -13,7 +14,6 @@ AC_DEFUN([gl_STDIO_H],
 #endif
 ])
   AC_DEFINE([__USE_MINGW_ANSI_STDIO])
-  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   gl_NEXT_HEADERS([stdio.h])
 
   dnl Determine whether __USE_MINGW_ANSI_STDIO makes printf and
@@ -40,17 +40,6 @@ AC_DEFUN([gl_STDIO_H],
        attribute "__gnu_printf__" instead of "__printf__"])
   fi
 
-  dnl No need to create extra modules for these functions. Everyone who uses
-  dnl <stdio.h> likely needs them.
-  GNULIB_FSCANF=1
-  gl_MODULE_INDICATOR([fscanf])
-  GNULIB_SCANF=1
-  gl_MODULE_INDICATOR([scanf])
-  GNULIB_FGETC=1
-  GNULIB_GETC=1
-  GNULIB_GETCHAR=1
-  GNULIB_FGETS=1
-  GNULIB_FREAD=1
   dnl This ifdef is necessary to avoid an error "missing file lib/stdio-read.c"
   dnl "expected source file, required through AC_LIBSOURCES, not found". It is
   dnl also an optimization, to avoid performing a configure check whose result
@@ -64,18 +53,6 @@ AC_DEFUN([gl_STDIO_H],
     fi
   ])
 
-  dnl No need to create extra modules for these functions. Everyone who uses
-  dnl <stdio.h> likely needs them.
-  GNULIB_FPRINTF=1
-  GNULIB_PRINTF=1
-  GNULIB_VFPRINTF=1
-  GNULIB_VPRINTF=1
-  GNULIB_FPUTC=1
-  GNULIB_PUTC=1
-  GNULIB_PUTCHAR=1
-  GNULIB_FPUTS=1
-  GNULIB_PUTS=1
-  GNULIB_FWRITE=1
   dnl This ifdef is necessary to avoid an error "missing file 
lib/stdio-write.c"
   dnl "expected source file, required through AC_LIBSOURCES, not found". It is
   dnl also an optimization, to avoid performing a configure check whose result
@@ -116,77 +93,92 @@ AC_DEFUN([gl_STDIO_H],
   fi
 ])
 
+# gl_STDIO_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_STDIO_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_STDIO_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_STDIO_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_STDIO_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_DPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FCLOSE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FDOPEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FFLUSH])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FGETC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FGETS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FOPEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FPRINTF_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FPURGE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FPUTC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FPUTS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FREAD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FREOPEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FSCANF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FSEEK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FSEEKO])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FTELL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FTELLO])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FWRITE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETCHAR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETDELIM])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETLINE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OBSTACK_PRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OBSTACK_PRINTF_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PCLOSE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PERROR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_POPEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PRINTF_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PUTC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PUTCHAR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PUTS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REMOVE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RENAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RENAMEAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SCANF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SNPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SPRINTF_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STDIO_H_NONBLOCKING])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STDIO_H_SIGPIPE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TMPFILE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VASPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VFSCANF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VSCANF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VDPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VFPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VFPRINTF_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VPRINTF_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VSNPRINTF])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_VSPRINTF_POSIX])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_FCLOSEALL], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_FDOPEN], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_FILENO], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_GETW], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_PUTW], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_TEMPNAM], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_STDIO_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_STDIO_H_DEFAULTS],
 [
-  GNULIB_DPRINTF=0;              AC_SUBST([GNULIB_DPRINTF])
-  GNULIB_FCLOSE=0;               AC_SUBST([GNULIB_FCLOSE])
-  GNULIB_FDOPEN=0;               AC_SUBST([GNULIB_FDOPEN])
-  GNULIB_FFLUSH=0;               AC_SUBST([GNULIB_FFLUSH])
-  GNULIB_FGETC=0;                AC_SUBST([GNULIB_FGETC])
-  GNULIB_FGETS=0;                AC_SUBST([GNULIB_FGETS])
-  GNULIB_FOPEN=0;                AC_SUBST([GNULIB_FOPEN])
-  GNULIB_FPRINTF=0;              AC_SUBST([GNULIB_FPRINTF])
-  GNULIB_FPRINTF_POSIX=0;        AC_SUBST([GNULIB_FPRINTF_POSIX])
-  GNULIB_FPURGE=0;               AC_SUBST([GNULIB_FPURGE])
-  GNULIB_FPUTC=0;                AC_SUBST([GNULIB_FPUTC])
-  GNULIB_FPUTS=0;                AC_SUBST([GNULIB_FPUTS])
-  GNULIB_FREAD=0;                AC_SUBST([GNULIB_FREAD])
-  GNULIB_FREOPEN=0;              AC_SUBST([GNULIB_FREOPEN])
-  GNULIB_FSCANF=0;               AC_SUBST([GNULIB_FSCANF])
-  GNULIB_FSEEK=0;                AC_SUBST([GNULIB_FSEEK])
-  GNULIB_FSEEKO=0;               AC_SUBST([GNULIB_FSEEKO])
-  GNULIB_FTELL=0;                AC_SUBST([GNULIB_FTELL])
-  GNULIB_FTELLO=0;               AC_SUBST([GNULIB_FTELLO])
-  GNULIB_FWRITE=0;               AC_SUBST([GNULIB_FWRITE])
-  GNULIB_GETC=0;                 AC_SUBST([GNULIB_GETC])
-  GNULIB_GETCHAR=0;              AC_SUBST([GNULIB_GETCHAR])
-  GNULIB_GETDELIM=0;             AC_SUBST([GNULIB_GETDELIM])
-  GNULIB_GETLINE=0;              AC_SUBST([GNULIB_GETLINE])
-  GNULIB_OBSTACK_PRINTF=0;       AC_SUBST([GNULIB_OBSTACK_PRINTF])
-  GNULIB_OBSTACK_PRINTF_POSIX=0; AC_SUBST([GNULIB_OBSTACK_PRINTF_POSIX])
-  GNULIB_PCLOSE=0;               AC_SUBST([GNULIB_PCLOSE])
-  GNULIB_PERROR=0;               AC_SUBST([GNULIB_PERROR])
-  GNULIB_POPEN=0;                AC_SUBST([GNULIB_POPEN])
-  GNULIB_PRINTF=0;               AC_SUBST([GNULIB_PRINTF])
-  GNULIB_PRINTF_POSIX=0;         AC_SUBST([GNULIB_PRINTF_POSIX])
-  GNULIB_PUTC=0;                 AC_SUBST([GNULIB_PUTC])
-  GNULIB_PUTCHAR=0;              AC_SUBST([GNULIB_PUTCHAR])
-  GNULIB_PUTS=0;                 AC_SUBST([GNULIB_PUTS])
-  GNULIB_REMOVE=0;               AC_SUBST([GNULIB_REMOVE])
-  GNULIB_RENAME=0;               AC_SUBST([GNULIB_RENAME])
-  GNULIB_RENAMEAT=0;             AC_SUBST([GNULIB_RENAMEAT])
-  GNULIB_SCANF=0;                AC_SUBST([GNULIB_SCANF])
-  GNULIB_SNPRINTF=0;             AC_SUBST([GNULIB_SNPRINTF])
-  GNULIB_SPRINTF_POSIX=0;        AC_SUBST([GNULIB_SPRINTF_POSIX])
-  GNULIB_STDIO_H_NONBLOCKING=0;  AC_SUBST([GNULIB_STDIO_H_NONBLOCKING])
-  GNULIB_STDIO_H_SIGPIPE=0;      AC_SUBST([GNULIB_STDIO_H_SIGPIPE])
-  GNULIB_TMPFILE=0;              AC_SUBST([GNULIB_TMPFILE])
-  GNULIB_VASPRINTF=0;            AC_SUBST([GNULIB_VASPRINTF])
-  GNULIB_VFSCANF=0;              AC_SUBST([GNULIB_VFSCANF])
-  GNULIB_VSCANF=0;               AC_SUBST([GNULIB_VSCANF])
-  GNULIB_VDPRINTF=0;             AC_SUBST([GNULIB_VDPRINTF])
-  GNULIB_VFPRINTF=0;             AC_SUBST([GNULIB_VFPRINTF])
-  GNULIB_VFPRINTF_POSIX=0;       AC_SUBST([GNULIB_VFPRINTF_POSIX])
-  GNULIB_VPRINTF=0;              AC_SUBST([GNULIB_VPRINTF])
-  GNULIB_VPRINTF_POSIX=0;        AC_SUBST([GNULIB_VPRINTF_POSIX])
-  GNULIB_VSNPRINTF=0;            AC_SUBST([GNULIB_VSNPRINTF])
-  GNULIB_VSPRINTF_POSIX=0;       AC_SUBST([GNULIB_VSPRINTF_POSIX])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_FCLOSEALL=1;        AC_SUBST([GNULIB_MDA_FCLOSEALL])
-  GNULIB_MDA_FDOPEN=1;           AC_SUBST([GNULIB_MDA_FDOPEN])
-  GNULIB_MDA_FILENO=1;           AC_SUBST([GNULIB_MDA_FILENO])
-  GNULIB_MDA_GETW=1;             AC_SUBST([GNULIB_MDA_GETW])
-  GNULIB_MDA_PUTW=1;             AC_SUBST([GNULIB_MDA_PUTW])
-  GNULIB_MDA_TEMPNAM=1;          AC_SUBST([GNULIB_MDA_TEMPNAM])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_DECL_FCLOSEALL=1;         AC_SUBST([HAVE_DECL_FCLOSEALL])
   HAVE_DECL_FPURGE=1;            AC_SUBST([HAVE_DECL_FPURGE])
diff --git a/m4/stdlib_h.m4 b/m4/stdlib_h.m4
index 5fdb0a706..9c1d1c76c 100644
--- a/m4/stdlib_h.m4
+++ b/m4/stdlib_h.m4
@@ -1,10 +1,10 @@
-# stdlib_h.m4 serial 59
+# stdlib_h.m4 serial 63
 dnl Copyright (C) 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_STDLIB_H],
+AC_DEFUN_ONCE([gl_STDLIB_H],
 [
   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
   gl_NEXT_HEADERS([stdlib.h])
@@ -46,63 +46,78 @@ AC_DEFUN([gl_STDLIB_H],
   fi
 ])
 
+# gl_STDLIB_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_STDLIB_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_STDLIB_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_STDLIB_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_STDLIB_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB__EXIT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ALIGNED_ALLOC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ATOLL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CALLOC_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CANONICALIZE_FILE_NAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FREE_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETLOADAVG])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETSUBOPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GRANTPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MALLOC_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBTOWC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKDTEMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKOSTEMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKOSTEMPS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKSTEMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKSTEMPS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_POSIX_MEMALIGN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_POSIX_OPENPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTSNAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTSNAME_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PUTENV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_QSORT_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RANDOM])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RANDOM_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REALLOCARRAY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REALLOC_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_REALPATH])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RPMATCH])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SECURE_GETENV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SETENV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOLD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOLL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOUL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOULL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SYSTEM_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UNLOCKPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UNSETENV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCTOMB])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_ECVT], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_FCVT], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_GCVT], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_MKTEMP], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_PUTENV], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_STDLIB_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_STDLIB_H_DEFAULTS],
 [
-  GNULIB__EXIT=0;         AC_SUBST([GNULIB__EXIT])
-  GNULIB_ALIGNED_ALLOC=0; AC_SUBST([GNULIB_ALIGNED_ALLOC])
-  GNULIB_ATOLL=0;         AC_SUBST([GNULIB_ATOLL])
-  GNULIB_CALLOC_POSIX=0;  AC_SUBST([GNULIB_CALLOC_POSIX])
-  GNULIB_CANONICALIZE_FILE_NAME=0;  AC_SUBST([GNULIB_CANONICALIZE_FILE_NAME])
-  GNULIB_FREE_POSIX=0;    AC_SUBST([GNULIB_FREE_POSIX])
-  GNULIB_GETLOADAVG=0;    AC_SUBST([GNULIB_GETLOADAVG])
-  GNULIB_GETSUBOPT=0;     AC_SUBST([GNULIB_GETSUBOPT])
-  GNULIB_GRANTPT=0;       AC_SUBST([GNULIB_GRANTPT])
-  GNULIB_MALLOC_POSIX=0;  AC_SUBST([GNULIB_MALLOC_POSIX])
-  GNULIB_MBTOWC=0;        AC_SUBST([GNULIB_MBTOWC])
-  GNULIB_MKDTEMP=0;       AC_SUBST([GNULIB_MKDTEMP])
-  GNULIB_MKOSTEMP=0;      AC_SUBST([GNULIB_MKOSTEMP])
-  GNULIB_MKOSTEMPS=0;     AC_SUBST([GNULIB_MKOSTEMPS])
-  GNULIB_MKSTEMP=0;       AC_SUBST([GNULIB_MKSTEMP])
-  GNULIB_MKSTEMPS=0;      AC_SUBST([GNULIB_MKSTEMPS])
-  GNULIB_POSIX_MEMALIGN=0;AC_SUBST([GNULIB_POSIX_MEMALIGN])
-  GNULIB_POSIX_OPENPT=0;  AC_SUBST([GNULIB_POSIX_OPENPT])
-  GNULIB_PTSNAME=0;       AC_SUBST([GNULIB_PTSNAME])
-  GNULIB_PTSNAME_R=0;     AC_SUBST([GNULIB_PTSNAME_R])
-  GNULIB_PUTENV=0;        AC_SUBST([GNULIB_PUTENV])
-  GNULIB_QSORT_R=0;       AC_SUBST([GNULIB_QSORT_R])
-  GNULIB_RANDOM=0;        AC_SUBST([GNULIB_RANDOM])
-  GNULIB_RANDOM_R=0;      AC_SUBST([GNULIB_RANDOM_R])
-  GNULIB_REALLOCARRAY=0;  AC_SUBST([GNULIB_REALLOCARRAY])
-  GNULIB_REALLOC_POSIX=0; AC_SUBST([GNULIB_REALLOC_POSIX])
-  GNULIB_REALPATH=0;      AC_SUBST([GNULIB_REALPATH])
-  GNULIB_RPMATCH=0;       AC_SUBST([GNULIB_RPMATCH])
-  GNULIB_SECURE_GETENV=0; AC_SUBST([GNULIB_SECURE_GETENV])
-  GNULIB_SETENV=0;        AC_SUBST([GNULIB_SETENV])
-  GNULIB_STRTOD=0;        AC_SUBST([GNULIB_STRTOD])
-  GNULIB_STRTOL=0;        AC_SUBST([GNULIB_STRTOL])
-  GNULIB_STRTOLD=0;       AC_SUBST([GNULIB_STRTOLD])
-  GNULIB_STRTOLL=0;       AC_SUBST([GNULIB_STRTOLL])
-  GNULIB_STRTOUL=0;       AC_SUBST([GNULIB_STRTOUL])
-  GNULIB_STRTOULL=0;      AC_SUBST([GNULIB_STRTOULL])
-  GNULIB_SYSTEM_POSIX=0;  AC_SUBST([GNULIB_SYSTEM_POSIX])
-  GNULIB_UNLOCKPT=0;      AC_SUBST([GNULIB_UNLOCKPT])
-  GNULIB_UNSETENV=0;      AC_SUBST([GNULIB_UNSETENV])
-  GNULIB_WCTOMB=0;        AC_SUBST([GNULIB_WCTOMB])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_ECVT=1;      AC_SUBST([GNULIB_MDA_ECVT])
-  GNULIB_MDA_FCVT=1;      AC_SUBST([GNULIB_MDA_FCVT])
-  GNULIB_MDA_GCVT=1;      AC_SUBST([GNULIB_MDA_GCVT])
-  GNULIB_MDA_MKTEMP=1;    AC_SUBST([GNULIB_MDA_MKTEMP])
-  GNULIB_MDA_PUTENV=1;    AC_SUBST([GNULIB_MDA_PUTENV])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE__EXIT=1;              AC_SUBST([HAVE__EXIT])
   HAVE_ALIGNED_ALLOC=1;      AC_SUBST([HAVE_ALIGNED_ALLOC])
@@ -164,6 +179,7 @@ AC_DEFUN([gl_STDLIB_H_DEFAULTS],
   REPLACE_RANDOM=0;          AC_SUBST([REPLACE_RANDOM])
   REPLACE_RANDOM_R=0;        AC_SUBST([REPLACE_RANDOM_R])
   REPLACE_REALLOC=0;         AC_SUBST([REPLACE_REALLOC])
+  REPLACE_REALLOCARRAY=0;    AC_SUBST([REPLACE_REALLOCARRAY])
   REPLACE_REALPATH=0;        AC_SUBST([REPLACE_REALPATH])
   REPLACE_SETENV=0;          AC_SUBST([REPLACE_SETENV])
   REPLACE_SETSTATE=0;        AC_SUBST([REPLACE_SETSTATE])
diff --git a/m4/strdup.m4 b/m4/strdup.m4
index f6f421d94..5b6018ff2 100644
--- a/m4/strdup.m4
+++ b/m4/strdup.m4
@@ -1,4 +1,4 @@
-# strdup.m4 serial 14
+# strdup.m4 serial 15
 
 dnl Copyright (C) 2002-2021 Free Software Foundation, Inc.
 
@@ -8,7 +8,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN([gl_FUNC_STRDUP],
 [
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
   AC_CHECK_DECLS_ONCE([strdup])
   if test $ac_cv_have_decl_strdup = no; then
     HAVE_DECL_STRDUP=0
@@ -17,7 +17,7 @@ AC_DEFUN([gl_FUNC_STRDUP],
 
 AC_DEFUN([gl_FUNC_STRDUP_POSIX],
 [
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
   AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
   if test $gl_cv_func_malloc_posix != yes; then
     REPLACE_STRDUP=1
diff --git a/m4/string_h.m4 b/m4/string_h.m4
index a4cc5b437..80d1e5875 100644
--- a/m4/string_h.m4
+++ b/m4/string_h.m4
@@ -5,20 +5,15 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 29
+# serial 32
 
 # Written by Paul Eggert.
 
-AC_DEFUN([gl_HEADER_STRING_H],
+AC_DEFUN_ONCE([gl_STRING_H],
 [
-  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
-  dnl once only, before all statements that occur in other macros.
-  AC_REQUIRE([gl_HEADER_STRING_H_BODY])
-])
-
-AC_DEFUN([gl_HEADER_STRING_H_BODY],
-[
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
   gl_NEXT_HEADERS([string.h])
 
   dnl Check for declarations of anything we want to poison if the
@@ -33,62 +28,77 @@ AC_DEFUN([gl_HEADER_STRING_H_BODY],
   AC_REQUIRE([AC_C_RESTRICT])
 ])
 
+# gl_STRING_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_STRING_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_STRING_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
-AC_DEFUN([gl_HEADER_STRING_H_DEFAULTS],
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_STRING_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_STRING_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXPLICIT_BZERO])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FFSL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FFSLL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMMEM])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMPCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMRCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RAWMEMCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STPCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STPNCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRCHRNUL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRDUP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRNCAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRNDUP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRNLEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRPBRK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRSEP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRSTR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRCASESTR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOK_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSLEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSNLEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSRCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSSTR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSCASECMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSNCASECMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSPCASECMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSCASESTR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSCSPN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSPBRK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSSPN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSSEP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSTOK_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRERROR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRERROR_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRERRORNAME_NP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGABBREV_NP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGDESCR_NP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRSIGNAL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRVERSCMP])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_MEMCCPY], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_STRDUP], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_STRING_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_STRING_H_DEFAULTS],
 [
-  GNULIB_EXPLICIT_BZERO=0;   AC_SUBST([GNULIB_EXPLICIT_BZERO])
-  GNULIB_FFSL=0;             AC_SUBST([GNULIB_FFSL])
-  GNULIB_FFSLL=0;            AC_SUBST([GNULIB_FFSLL])
-  GNULIB_MEMCHR=0;           AC_SUBST([GNULIB_MEMCHR])
-  GNULIB_MEMMEM=0;           AC_SUBST([GNULIB_MEMMEM])
-  GNULIB_MEMPCPY=0;          AC_SUBST([GNULIB_MEMPCPY])
-  GNULIB_MEMRCHR=0;          AC_SUBST([GNULIB_MEMRCHR])
-  GNULIB_RAWMEMCHR=0;        AC_SUBST([GNULIB_RAWMEMCHR])
-  GNULIB_STPCPY=0;           AC_SUBST([GNULIB_STPCPY])
-  GNULIB_STPNCPY=0;          AC_SUBST([GNULIB_STPNCPY])
-  GNULIB_STRCHRNUL=0;        AC_SUBST([GNULIB_STRCHRNUL])
-  GNULIB_STRDUP=0;           AC_SUBST([GNULIB_STRDUP])
-  GNULIB_STRNCAT=0;          AC_SUBST([GNULIB_STRNCAT])
-  GNULIB_STRNDUP=0;          AC_SUBST([GNULIB_STRNDUP])
-  GNULIB_STRNLEN=0;          AC_SUBST([GNULIB_STRNLEN])
-  GNULIB_STRPBRK=0;          AC_SUBST([GNULIB_STRPBRK])
-  GNULIB_STRSEP=0;           AC_SUBST([GNULIB_STRSEP])
-  GNULIB_STRSTR=0;           AC_SUBST([GNULIB_STRSTR])
-  GNULIB_STRCASESTR=0;       AC_SUBST([GNULIB_STRCASESTR])
-  GNULIB_STRTOK_R=0;         AC_SUBST([GNULIB_STRTOK_R])
-  GNULIB_MBSLEN=0;           AC_SUBST([GNULIB_MBSLEN])
-  GNULIB_MBSNLEN=0;          AC_SUBST([GNULIB_MBSNLEN])
-  GNULIB_MBSCHR=0;           AC_SUBST([GNULIB_MBSCHR])
-  GNULIB_MBSRCHR=0;          AC_SUBST([GNULIB_MBSRCHR])
-  GNULIB_MBSSTR=0;           AC_SUBST([GNULIB_MBSSTR])
-  GNULIB_MBSCASECMP=0;       AC_SUBST([GNULIB_MBSCASECMP])
-  GNULIB_MBSNCASECMP=0;      AC_SUBST([GNULIB_MBSNCASECMP])
-  GNULIB_MBSPCASECMP=0;      AC_SUBST([GNULIB_MBSPCASECMP])
-  GNULIB_MBSCASESTR=0;       AC_SUBST([GNULIB_MBSCASESTR])
-  GNULIB_MBSCSPN=0;          AC_SUBST([GNULIB_MBSCSPN])
-  GNULIB_MBSPBRK=0;          AC_SUBST([GNULIB_MBSPBRK])
-  GNULIB_MBSSPN=0;           AC_SUBST([GNULIB_MBSSPN])
-  GNULIB_MBSSEP=0;           AC_SUBST([GNULIB_MBSSEP])
-  GNULIB_MBSTOK_R=0;         AC_SUBST([GNULIB_MBSTOK_R])
-  GNULIB_STRERROR=0;         AC_SUBST([GNULIB_STRERROR])
-  GNULIB_STRERROR_R=0;       AC_SUBST([GNULIB_STRERROR_R])
-  GNULIB_STRERRORNAME_NP=0;  AC_SUBST([GNULIB_STRERRORNAME_NP])
-  GNULIB_SIGABBREV_NP=0;     AC_SUBST([GNULIB_SIGABBREV_NP])
-  GNULIB_SIGDESCR_NP=0;      AC_SUBST([GNULIB_SIGDESCR_NP])
-  GNULIB_STRSIGNAL=0;        AC_SUBST([GNULIB_STRSIGNAL])
-  GNULIB_STRVERSCMP=0;       AC_SUBST([GNULIB_STRVERSCMP])
   HAVE_MBSLEN=0;             AC_SUBST([HAVE_MBSLEN])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_MEMCCPY=1;      AC_SUBST([GNULIB_MDA_MEMCCPY])
-  GNULIB_MDA_STRDUP=1;       AC_SUBST([GNULIB_MDA_STRDUP])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_EXPLICIT_BZERO=1;        AC_SUBST([HAVE_EXPLICIT_BZERO])
   HAVE_FFSL=1;                  AC_SUBST([HAVE_FFSL])
diff --git a/m4/sys_file_h.m4 b/m4/sys_file_h.m4
index 99c2285dd..bcde4d70b 100644
--- a/m4/sys_file_h.m4
+++ b/m4/sys_file_h.m4
@@ -1,5 +1,5 @@
 # Configure a replacement for <sys/file.h>.
-# serial 6
+# serial 9
 
 # Copyright (C) 2008-2021 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -8,9 +8,9 @@
 
 # Written by Richard W.M. Jones.
 
-AC_DEFUN([gl_HEADER_SYS_FILE_H],
+AC_DEFUN_ONCE([gl_SYS_FILE_H],
 [
-  AC_REQUIRE([gl_HEADER_SYS_FILE_H_DEFAULTS])
+  AC_REQUIRE([gl_SYS_FILE_H_DEFAULTS])
 
   dnl <sys/file.h> is always overridden, because of GNULIB_POSIXCHECK.
   gl_CHECK_NEXT_HEADERS([sys/file.h])
@@ -28,14 +28,29 @@ AC_DEFUN([gl_HEADER_SYS_FILE_H],
     ]], [flock])
 ])
 
-AC_DEFUN([gl_HEADER_SYS_FILE_MODULE_INDICATOR],
+# gl_SYS_FILE_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
+AC_DEFUN([gl_SYS_FILE_MODULE_INDICATOR],
 [
-  AC_REQUIRE([gl_HEADER_SYS_FILE_H_DEFAULTS])
+  gl_SYS_FILE_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 ])
 
-AC_DEFUN([gl_HEADER_SYS_FILE_H_DEFAULTS],
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_FILE_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_FILE_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FLOCK])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_FILE_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_FILE_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_SYS_FILE_H_DEFAULTS],
 [
-  GNULIB_FLOCK=0;        AC_SUBST([GNULIB_FLOCK])
   HAVE_FLOCK=1;          AC_SUBST([HAVE_FLOCK])
 ])
diff --git a/m4/sys_random_h.m4 b/m4/sys_random_h.m4
index 45e0469ba..37bc31606 100644
--- a/m4/sys_random_h.m4
+++ b/m4/sys_random_h.m4
@@ -1,10 +1,10 @@
-# sys_random_h.m4 serial 5
+# sys_random_h.m4 serial 8
 dnl Copyright (C) 2020-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_HEADER_SYS_RANDOM],
+AC_DEFUN_ONCE([gl_SYS_RANDOM_H],
 [
   AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
   dnl <sys/random.h> is always overridden, because of GNULIB_POSIXCHECK.
@@ -35,18 +35,33 @@ AC_DEFUN([gl_HEADER_SYS_RANDOM],
     [getrandom])
 ])
 
+# gl_SYS_RANDOM_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SYS_RANDOM_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SYS_RANDOM_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_RANDOM_H_REQUIRE_DEFAULTS],
+[
+  
m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETRANDOM])
+  ])
+  
m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SYS_RANDOM_H_DEFAULTS],
 [
-  GNULIB_GETRANDOM=0;     AC_SUBST([GNULIB_GETRANDOM])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_GETRANDOM=1;       AC_SUBST([HAVE_GETRANDOM])
   REPLACE_GETRANDOM=0;    AC_SUBST([REPLACE_GETRANDOM])
diff --git a/m4/sys_select_h.m4 b/m4/sys_select_h.m4
index 4b33d312e..2e7d140de 100644
--- a/m4/sys_select_h.m4
+++ b/m4/sys_select_h.m4
@@ -1,13 +1,13 @@
-# sys_select_h.m4 serial 20
+# sys_select_h.m4 serial 23
 dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_HEADER_SYS_SELECT],
+AC_DEFUN_ONCE([gl_SYS_SELECT_H],
 [
-  AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
+  AC_REQUIRE([AC_C_RESTRICT])
   AC_CACHE_CHECK([whether <sys/select.h> is self-contained],
     [gl_cv_header_sys_select_h_selfcontained],
     [
@@ -75,19 +75,34 @@ AC_DEFUN([gl_HEADER_SYS_SELECT],
     ]], [pselect select])
 ])
 
+# gl_SYS_SELECT_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SYS_SELECT_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SYS_SELECT_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_SELECT_H_REQUIRE_DEFAULTS],
+[
+  
m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_SELECT_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PSELECT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SELECT])
+  ])
+  
m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_SELECT_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SYS_SELECT_H_DEFAULTS],
 [
-  GNULIB_PSELECT=0; AC_SUBST([GNULIB_PSELECT])
-  GNULIB_SELECT=0; AC_SUBST([GNULIB_SELECT])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_PSELECT=1; AC_SUBST([HAVE_PSELECT])
   REPLACE_PSELECT=0; AC_SUBST([REPLACE_PSELECT])
diff --git a/m4/sys_socket_h.m4 b/m4/sys_socket_h.m4
index 503cb9668..5676a0d21 100644
--- a/m4/sys_socket_h.m4
+++ b/m4/sys_socket_h.m4
@@ -1,4 +1,4 @@
-# sys_socket_h.m4 serial 25
+# sys_socket_h.m4 serial 28
 dnl Copyright (C) 2005-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl From Simon Josefsson.
 
-AC_DEFUN([gl_HEADER_SYS_SOCKET],
+AC_DEFUN_ONCE([gl_SYS_SOCKET_H],
 [
   AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
   AC_REQUIRE([AC_CANONICAL_HOST])
@@ -156,32 +156,47 @@ AC_DEFUN([gl_PREREQ_SYS_H_WS2TCPIP],
   AC_SUBST([HAVE_WS2TCPIP_H])
 ])
 
+# gl_SYS_SOCKET_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SYS_SOCKET_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SYS_SOCKET_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_SOCKET_H_REQUIRE_DEFAULTS],
+[
+  
m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_SOCKET_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SOCKET])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CONNECT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACCEPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_BIND])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETPEERNAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETSOCKNAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETSOCKOPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LISTEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RECV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SEND])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RECVFROM])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SENDTO])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SETSOCKOPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SHUTDOWN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACCEPT4])
+  ])
+  
m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_SOCKET_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SYS_SOCKET_H_DEFAULTS],
 [
-  GNULIB_SOCKET=0;      AC_SUBST([GNULIB_SOCKET])
-  GNULIB_CONNECT=0;     AC_SUBST([GNULIB_CONNECT])
-  GNULIB_ACCEPT=0;      AC_SUBST([GNULIB_ACCEPT])
-  GNULIB_BIND=0;        AC_SUBST([GNULIB_BIND])
-  GNULIB_GETPEERNAME=0; AC_SUBST([GNULIB_GETPEERNAME])
-  GNULIB_GETSOCKNAME=0; AC_SUBST([GNULIB_GETSOCKNAME])
-  GNULIB_GETSOCKOPT=0;  AC_SUBST([GNULIB_GETSOCKOPT])
-  GNULIB_LISTEN=0;      AC_SUBST([GNULIB_LISTEN])
-  GNULIB_RECV=0;        AC_SUBST([GNULIB_RECV])
-  GNULIB_SEND=0;        AC_SUBST([GNULIB_SEND])
-  GNULIB_RECVFROM=0;    AC_SUBST([GNULIB_RECVFROM])
-  GNULIB_SENDTO=0;      AC_SUBST([GNULIB_SENDTO])
-  GNULIB_SETSOCKOPT=0;  AC_SUBST([GNULIB_SETSOCKOPT])
-  GNULIB_SHUTDOWN=0;    AC_SUBST([GNULIB_SHUTDOWN])
-  GNULIB_ACCEPT4=0;     AC_SUBST([GNULIB_ACCEPT4])
   HAVE_STRUCT_SOCKADDR_STORAGE=1; AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE])
   HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=1;
                         AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY])
diff --git a/m4/sys_stat_h.m4 b/m4/sys_stat_h.m4
index 23cbdd28e..ac91d425b 100644
--- a/m4/sys_stat_h.m4
+++ b/m4/sys_stat_h.m4
@@ -1,4 +1,4 @@
-# sys_stat_h.m4 serial 38   -*- Autoconf -*-
+# sys_stat_h.m4 serial 41   -*- Autoconf -*-
 dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -7,7 +7,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 dnl From Eric Blake.
 dnl Provide a GNU-like <sys/stat.h>.
 
-AC_DEFUN([gl_HEADER_SYS_STAT_H],
+AC_DEFUN_ONCE([gl_SYS_STAT_H],
 [
   AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
 
@@ -52,38 +52,53 @@ AC_DEFUN([gl_HEADER_SYS_STAT_H],
   AC_REQUIRE([AC_C_RESTRICT])
 ])
 
+# gl_SYS_STAT_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SYS_STAT_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SYS_STAT_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_STAT_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_STAT_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_UNISTD_H_REQUIRE_DEFAULTS dnl for REPLACE_FCHDIR
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FCHMODAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FSTAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FSTATAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FUTIMENS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETUMASK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LCHMOD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LSTAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKDIRAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKFIFO])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKFIFOAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKNOD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKNODAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UTIMENSAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_OVERRIDES_STRUCT_STAT])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_CHMOD], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_MKDIR], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_UMASK], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_STAT_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SYS_STAT_H_DEFAULTS],
 [
-  AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) dnl for REPLACE_FCHDIR
-  GNULIB_FCHMODAT=0;    AC_SUBST([GNULIB_FCHMODAT])
-  GNULIB_FSTAT=0;       AC_SUBST([GNULIB_FSTAT])
-  GNULIB_FSTATAT=0;     AC_SUBST([GNULIB_FSTATAT])
-  GNULIB_FUTIMENS=0;    AC_SUBST([GNULIB_FUTIMENS])
-  GNULIB_GETUMASK=0;    AC_SUBST([GNULIB_GETUMASK])
-  GNULIB_LCHMOD=0;      AC_SUBST([GNULIB_LCHMOD])
-  GNULIB_LSTAT=0;       AC_SUBST([GNULIB_LSTAT])
-  GNULIB_MKDIR=0;       AC_SUBST([GNULIB_MKDIR])
-  GNULIB_MKDIRAT=0;     AC_SUBST([GNULIB_MKDIRAT])
-  GNULIB_MKFIFO=0;      AC_SUBST([GNULIB_MKFIFO])
-  GNULIB_MKFIFOAT=0;    AC_SUBST([GNULIB_MKFIFOAT])
-  GNULIB_MKNOD=0;       AC_SUBST([GNULIB_MKNOD])
-  GNULIB_MKNODAT=0;     AC_SUBST([GNULIB_MKNODAT])
-  GNULIB_STAT=0;        AC_SUBST([GNULIB_STAT])
-  GNULIB_UTIMENSAT=0;   AC_SUBST([GNULIB_UTIMENSAT])
-  GNULIB_OVERRIDES_STRUCT_STAT=0; AC_SUBST([GNULIB_OVERRIDES_STRUCT_STAT])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_CHMOD=1;   AC_SUBST([GNULIB_MDA_CHMOD])
-  GNULIB_MDA_MKDIR=1;   AC_SUBST([GNULIB_MDA_MKDIR])
-  GNULIB_MDA_UMASK=1;   AC_SUBST([GNULIB_MDA_UMASK])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_FCHMODAT=1;      AC_SUBST([HAVE_FCHMODAT])
   HAVE_FSTATAT=1;       AC_SUBST([HAVE_FSTATAT])
diff --git a/m4/sys_time_h.m4 b/m4/sys_time_h.m4
index 64f133d51..c425a9639 100644
--- a/m4/sys_time_h.m4
+++ b/m4/sys_time_h.m4
@@ -1,5 +1,5 @@
 # Configure a replacement for <sys/time.h>.
-# serial 9
+# serial 12
 
 # Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -8,18 +8,13 @@
 
 # Written by Paul Eggert and Martin Lambers.
 
-AC_DEFUN([gl_HEADER_SYS_TIME_H],
+AC_DEFUN_ONCE([gl_SYS_TIME_H],
 [
   dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
   dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
   dnl statements that occur in other macros.
-  AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
-])
-
-AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
-[
+  AC_REQUIRE([gl_SYS_TIME_H_DEFAULTS])
   AC_REQUIRE([AC_C_RESTRICT])
-  AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
   AC_CHECK_HEADERS_ONCE([sys/time.h])
   gl_CHECK_NEXT_HEADERS([sys/time.h])
 
@@ -89,18 +84,33 @@ AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
     ]], [gettimeofday])
 ])
 
+# gl_SYS_TIME_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SYS_TIME_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
-AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_TIME_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETTIMEOFDAY])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_TIME_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_TIME_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_SYS_TIME_H_DEFAULTS],
 [
-  GNULIB_GETTIMEOFDAY=0;     AC_SUBST([GNULIB_GETTIMEOFDAY])
   dnl Assume POSIX behavior unless another module says otherwise.
   HAVE_GETTIMEOFDAY=1;       AC_SUBST([HAVE_GETTIMEOFDAY])
   HAVE_STRUCT_TIMEVAL=1;     AC_SUBST([HAVE_STRUCT_TIMEVAL])
diff --git a/m4/sys_times_h.m4 b/m4/sys_times_h.m4
index b9daaa7ca..577ead66f 100644
--- a/m4/sys_times_h.m4
+++ b/m4/sys_times_h.m4
@@ -1,5 +1,5 @@
 # Configure a replacement for <sys/times.h>.
-# serial 8
+# serial 11
 
 # Copyright (C) 2008-2021 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -8,7 +8,7 @@
 
 # Written by Simon Josefsson.
 
-AC_DEFUN([gl_SYS_TIMES_H],
+AC_DEFUN_ONCE([gl_SYS_TIMES_H],
 [
   AC_REQUIRE([gl_SYS_TIMES_H_DEFAULTS])
 
@@ -36,16 +36,31 @@ AC_DEFUN([gl_SYS_TIMES_H],
     ]], [times])
 ])
 
+# gl_SYS_TIMES_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SYS_TIMES_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SYS_TIMES_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SYS_TIMES_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_TIMES_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_TIMES_H_MODULE_INDICATOR_DEFAULTS], 
[
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMES])
+  ])
+  
m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_TIMES_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_TIMES_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SYS_TIMES_H_DEFAULTS],
 [
-  GNULIB_TIMES=0;     AC_SUBST([GNULIB_TIMES])
   HAVE_STRUCT_TMS=1;  AC_SUBST([HAVE_STRUCT_TMS])
   HAVE_TIMES=1;       AC_SUBST([HAVE_TIMES])
 ])
diff --git a/m4/sys_types_h.m4 b/m4/sys_types_h.m4
index 2172c836d..6dd6fee10 100644
--- a/m4/sys_types_h.m4
+++ b/m4/sys_types_h.m4
@@ -1,4 +1,4 @@
-# sys_types_h.m4 serial 11
+# sys_types_h.m4 serial 13
 dnl Copyright (C) 2011-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,10 +6,11 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN_ONCE([gl_SYS_TYPES_H],
 [
+  AC_REQUIRE([gl_SYS_TYPES_H_DEFAULTS])
+
   dnl Use sane struct stat types in OpenVMS 8.2 and later.
   AC_DEFINE([_USE_STD_STAT], 1, [For standard stat data types on VMS.])
 
-  AC_REQUIRE([gl_SYS_TYPES_H_DEFAULTS])
   gl_NEXT_HEADERS([sys/types.h])
 
   dnl Ensure the type pid_t gets defined.
@@ -30,6 +31,17 @@ AC_DEFUN_ONCE([gl_SYS_TYPES_H],
   AC_SUBST([WINDOWS_STAT_INODES])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_TYPES_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_TYPE_H_MODULE_INDICATOR_DEFAULTS], [
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_TYPE_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_TYPES_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SYS_TYPES_H_DEFAULTS],
 [
 ])
diff --git a/m4/sys_uio_h.m4 b/m4/sys_uio_h.m4
index 503de4d1f..fa176e0b6 100644
--- a/m4/sys_uio_h.m4
+++ b/m4/sys_uio_h.m4
@@ -1,10 +1,10 @@
-# sys_uio_h.m4 serial 1
+# sys_uio_h.m4 serial 3
 dnl Copyright (C) 2011-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_HEADER_SYS_UIO],
+AC_DEFUN_ONCE([gl_SYS_UIO_H],
 [
   AC_REQUIRE([gl_SYS_UIO_H_DEFAULTS])
   dnl <sys/uio.h> is always overridden, because of GNULIB_POSIXCHECK.
@@ -17,15 +17,30 @@ AC_DEFUN([gl_HEADER_SYS_UIO],
   AC_SUBST([HAVE_SYS_UIO_H])
 ])
 
+# gl_SYS_UIO_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_SYS_UIO_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SYS_UIO_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_SYS_UIO_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_SYS_UIO_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_UIO_H_MODULE_INDICATOR_DEFAULTS], [
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_UIO_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_SYS_UIO_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_SYS_UIO_H_DEFAULTS],
 [
 ])
diff --git a/m4/threadlib.m4 b/m4/threadlib.m4
index 8fc3dfd1f..37b797c18 100644
--- a/m4/threadlib.m4
+++ b/m4/threadlib.m4
@@ -1,4 +1,4 @@
-# threadlib.m4 serial 30
+# threadlib.m4 serial 31
 dnl Copyright (C) 2005-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -212,6 +212,27 @@ AC_DEFUN([gl_PTHREADLIB_BODY],
         LIBS=$save_LIBS
         test $gl_pthread_api = yes && break
       done
+      echo "$as_me:__oline__: gl_pthread_api=$gl_pthread_api" 
>&AS_MESSAGE_LOG_FD
+      echo "$as_me:__oline__: LIBPTHREAD=$LIBPTHREAD" >&AS_MESSAGE_LOG_FD
+
+      gl_pthread_in_glibc=no
+      # On Linux with glibc >= 2.34, libc contains the fully functional
+      # pthread functions.
+      case "$host_os" in
+        linux*)
+          AC_EGREP_CPP([Lucky user],
+            [#include <features.h>
+             #ifdef __GNU_LIBRARY__
+              #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 34) || (__GLIBC__ > 2)
+               Lucky user
+              #endif
+             #endif
+            ],
+            [gl_pthread_in_glibc=yes],
+            [])
+          ;;
+      esac
+      echo "$as_me:__oline__: gl_pthread_in_glibc=$gl_pthread_in_glibc" 
>&AS_MESSAGE_LOG_FD
 
       # Test for libpthread by looking for pthread_kill. (Not pthread_self,
       # since it is defined as a macro on OSF/1.)
@@ -219,18 +240,22 @@ AC_DEFUN([gl_PTHREADLIB_BODY],
         # The program links fine without libpthread. But it may actually
         # need to link with libpthread in order to create multiple threads.
         AC_CHECK_LIB([pthread], [pthread_kill],
-          [LIBPMULTITHREAD=-lpthread
-           # On Solaris and HP-UX, most pthread functions exist also in libc.
-           # Therefore pthread_in_use() needs to actually try to create a
-           # thread: pthread_create from libc will fail, whereas
-           # pthread_create will actually create a thread.
-           # On Solaris 10 or newer, this test is no longer needed, because
-           # libc contains the fully functional pthread functions.
-           case "$host_os" in
-             solaris | solaris2.[1-9] | solaris2.[1-9].* | hpux*)
-               AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1],
-                 [Define if the pthread_in_use() detection is hard.])
-           esac
+          [if test $gl_pthread_in_glibc = yes; then
+             LIBPMULTITHREAD=
+           else
+             LIBPMULTITHREAD=-lpthread
+             # On Solaris and HP-UX, most pthread functions exist also in libc.
+             # Therefore pthread_in_use() needs to actually try to create a
+             # thread: pthread_create from libc will fail, whereas
+             # pthread_create will actually create a thread.
+             # On Solaris 10 or newer, this test is no longer needed, because
+             # libc contains the fully functional pthread functions.
+             case "$host_os" in
+               solaris | solaris2.[1-9] | solaris2.[1-9].* | hpux*)
+                 AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1],
+                   [Define if the pthread_in_use() detection is hard.])
+             esac
+           fi
           ])
       elif test $gl_pthread_api != yes; then
         # Some library is needed. Try libpthread and libc_r.
@@ -246,6 +271,7 @@ AC_DEFUN([gl_PTHREADLIB_BODY],
              LIBPMULTITHREAD=-lc_r])
         fi
       fi
+      echo "$as_me:__oline__: LIBPMULTITHREAD=$LIBPMULTITHREAD" 
>&AS_MESSAGE_LOG_FD
     fi
     AC_MSG_CHECKING([whether POSIX threads API is available])
     AC_MSG_RESULT([$gl_pthread_api])
@@ -311,7 +337,8 @@ AC_DEFUN([gl_STDTHREADLIB_BODY],
           dnl glibc >= 2.29 has thrd_create in libpthread.
           dnl FreeBSD >= 10 has thrd_create in libstdthreads; this library 
depends
           dnl on libpthread (for the symbol 'pthread_mutexattr_gettype').
-          dnl AIX >= 7.1 and Solaris >= 11.4 have thrd_create in libc.
+          dnl glibc >= 2.34, AIX >= 7.1, and Solaris >= 11.4 have thrd_create 
in
+          dnl libc.
           AC_CHECK_FUNCS([thrd_create])
           if test $ac_cv_func_thrd_create = yes; then
             LIBSTDTHREAD=
@@ -481,7 +508,10 @@ AC_DEFUN([gl_THREADLIB_BODY],
           gl_threads_api=posix
           AC_DEFINE([USE_POSIX_THREADS], [1],
             [Define if the POSIX multithreading library can be used.])
-          if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
+          if test -z "$LIBMULTITHREAD" && test -z "$LTLIBMULTITHREAD"; then
+            AC_DEFINE([USE_POSIX_THREADS_FROM_LIBC], [1],
+              [Define if references to the POSIX multithreading library are 
satisfied by libc.])
+          else
             if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then
               AC_DEFINE([USE_POSIX_THREADS_WEAK], [1],
                 [Define if references to the POSIX multithreading library 
should be made weak.])
@@ -576,7 +606,9 @@ dnl                    flavours   option      weak       
result
 dnl ---------------    ---------  ---------   --------   ---------
 dnl Linux 2.4/glibc    posix      -lpthread       Y      OK
 dnl
-dnl GNU Hurd/glibc     posix
+dnl Linux/glibc 2.34   posix                      Y      OK
+dnl
+dnl GNU Hurd/glibc     posix      -lpthread       Y      OK
 dnl
 dnl Ubuntu 14.04       posix      -pthread        Y      OK
 dnl
diff --git a/m4/time_h.m4 b/m4/time_h.m4
index b6a1aa3bc..b57474b48 100644
--- a/m4/time_h.m4
+++ b/m4/time_h.m4
@@ -2,7 +2,7 @@
 
 # Copyright (C) 2000-2001, 2003-2007, 2009-2021 Free Software Foundation, Inc.
 
-# serial 15
+# serial 18
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -10,16 +10,11 @@
 
 # Written by Paul Eggert and Jim Meyering.
 
-AC_DEFUN([gl_HEADER_TIME_H],
+AC_DEFUN_ONCE([gl_TIME_H],
 [
-  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
-  dnl once only, before all statements that occur in other macros.
-  AC_REQUIRE([gl_HEADER_TIME_H_BODY])
-])
-
-AC_DEFUN([gl_HEADER_TIME_H_BODY],
-[
-  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
+  AC_REQUIRE([gl_TIME_H_DEFAULTS])
 
   gl_NEXT_HEADERS([time.h])
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
@@ -111,30 +106,45 @@ AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
   AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC])
 ])
 
+# gl_TIME_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_TIME_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_TIME_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
-AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_TIME_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CTIME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKTIME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOCALTIME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_NANOSLEEP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRFTIME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRPTIME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMEGM])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMESPEC_GET])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_RZ])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TZSET])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_TZSET], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_TIME_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_TIME_H_DEFAULTS],
 [
-  GNULIB_CTIME=0;                        AC_SUBST([GNULIB_CTIME])
-  GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
-  GNULIB_LOCALTIME=0;                    AC_SUBST([GNULIB_LOCALTIME])
-  GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
-  GNULIB_STRFTIME=0;                     AC_SUBST([GNULIB_STRFTIME])
-  GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
-  GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
-  GNULIB_TIMESPEC_GET=0;                 AC_SUBST([GNULIB_TIMESPEC_GET])
-  GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
-  GNULIB_TIME_RZ=0;                      AC_SUBST([GNULIB_TIME_RZ])
-  GNULIB_TZSET=0;                        AC_SUBST([GNULIB_TZSET])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_TZSET=1;                    AC_SUBST([GNULIB_MDA_TZSET])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
   HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
diff --git a/m4/time_r.m4 b/m4/time_r.m4
index 713e93ac2..2d49b64f1 100644
--- a/m4/time_r.m4
+++ b/m4/time_r.m4
@@ -12,7 +12,7 @@ AC_DEFUN([gl_TIME_R],
   dnl Persuade glibc and Solaris <time.h> to declare localtime_r.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
-  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  AC_REQUIRE([gl_TIME_H_DEFAULTS])
   AC_REQUIRE([AC_C_RESTRICT])
 
   dnl Some systems don't declare localtime_r() and gmtime_r() if _REENTRANT is
diff --git a/m4/time_rz.m4 b/m4/time_rz.m4
index 34ef0bab4..c5e85dc62 100644
--- a/m4/time_rz.m4
+++ b/m4/time_rz.m4
@@ -10,7 +10,7 @@ dnl Written by Paul Eggert.
 AC_DEFUN([gl_TIME_RZ],
 [
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  AC_REQUIRE([gl_TIME_H_DEFAULTS])
   AC_REQUIRE([AC_STRUCT_TIMEZONE])
 
   # On Mac OS X 10.6, localtime loops forever with some time_t values.
diff --git a/m4/timegm.m4 b/m4/timegm.m4
index 098c857e7..58123beb0 100644
--- a/m4/timegm.m4
+++ b/m4/timegm.m4
@@ -1,4 +1,4 @@
-# timegm.m4 serial 12
+# timegm.m4 serial 13
 dnl Copyright (C) 2003, 2007, 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,7 +6,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 AC_DEFUN([gl_FUNC_TIMEGM],
 [
-  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  AC_REQUIRE([gl_TIME_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_MKTIME_WORKS])
   REPLACE_TIMEGM=0
   AC_CHECK_FUNCS_ONCE([timegm])
diff --git a/m4/tzset.m4 b/m4/tzset.m4
index 8eaf41f41..8a4f28557 100644
--- a/m4/tzset.m4
+++ b/m4/tzset.m4
@@ -1,4 +1,4 @@
-# serial 15
+# serial 16
 
 # Copyright (C) 2003, 2007, 2009-2021 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -9,7 +9,7 @@
 
 AC_DEFUN([gl_FUNC_TZSET],
 [
-  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  AC_REQUIRE([gl_TIME_H_DEFAULTS])
   AC_REQUIRE([AC_CANONICAL_HOST])
   REPLACE_TZSET=0
   case "$host_os" in
diff --git a/m4/unistd_h.m4 b/m4/unistd_h.m4
index 0f26fb908..0ce4ea451 100644
--- a/m4/unistd_h.m4
+++ b/m4/unistd_h.m4
@@ -1,4 +1,4 @@
-# unistd_h.m4 serial 85
+# unistd_h.m4 serial 89
 dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,10 +6,10 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl Written by Simon Josefsson, Bruno Haible.
 
-AC_DEFUN([gl_UNISTD_H],
+AC_DEFUN_ONCE([gl_UNISTD_H],
 [
-  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
-  dnl once only, before all statements that occur in other macros.
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
 
   gl_CHECK_NEXT_HEADERS([unistd.h])
@@ -59,100 +59,116 @@ AC_DEFUN([gl_UNISTD_H],
   fi
 ])
 
+# gl_UNISTD_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_UNISTD_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_UNISTD_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_UNISTD_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_UNISTD_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACCESS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CHDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CHOWN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CLOSE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_COPY_FILE_RANGE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_DUP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_DUP2])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_DUP3])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ENVIRON])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EUIDACCESS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXECL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXECLE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXECLP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXECV])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXECVE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXECVP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_EXECVPE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FACCESSAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FCHDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FCHOWNAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FDATASYNC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FSYNC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FTRUNCATE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETCWD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETDOMAINNAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETDTABLESIZE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETENTROPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETGROUPS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETHOSTNAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETLOGIN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETLOGIN_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETOPT_POSIX])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETPAGESIZE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETPASS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETUSERSHELL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GROUP_MEMBER])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISATTY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LCHOWN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LINK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LINKAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LSEEK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PIPE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PIPE2])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PREAD])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PWRITE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_READ])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_READLINK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_READLINKAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RMDIR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SETHOSTNAME])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SLEEP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SYMLINK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SYMLINKAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TRUNCATE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TTYNAME_R])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UNISTD_H_GETOPT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UNISTD_H_NONBLOCKING])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UNISTD_H_SIGPIPE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UNLINK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_UNLINKAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_USLEEP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WRITE])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_ACCESS], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_CHDIR], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_CLOSE], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_DUP], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_DUP2], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_EXECL], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_EXECLE], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_EXECLP], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_EXECV], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_EXECVE], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_EXECVP], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_EXECVPE], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_GETCWD], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_GETPID], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_ISATTY], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_LSEEK], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_READ], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_RMDIR], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_SWAB], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_UNLINK], [1])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_WRITE], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_UNISTD_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_UNISTD_H_DEFAULTS],
 [
-  GNULIB_ACCESS=0;               AC_SUBST([GNULIB_ACCESS])
-  GNULIB_CHDIR=0;                AC_SUBST([GNULIB_CHDIR])
-  GNULIB_CHOWN=0;                AC_SUBST([GNULIB_CHOWN])
-  GNULIB_CLOSE=0;                AC_SUBST([GNULIB_CLOSE])
-  GNULIB_COPY_FILE_RANGE=0;      AC_SUBST([GNULIB_COPY_FILE_RANGE])
-  GNULIB_DUP=0;                  AC_SUBST([GNULIB_DUP])
-  GNULIB_DUP2=0;                 AC_SUBST([GNULIB_DUP2])
-  GNULIB_DUP3=0;                 AC_SUBST([GNULIB_DUP3])
-  GNULIB_ENVIRON=0;              AC_SUBST([GNULIB_ENVIRON])
-  GNULIB_EUIDACCESS=0;           AC_SUBST([GNULIB_EUIDACCESS])
-  GNULIB_EXECL=0;                AC_SUBST([GNULIB_EXECL])
-  GNULIB_EXECLE=0;               AC_SUBST([GNULIB_EXECLE])
-  GNULIB_EXECLP=0;               AC_SUBST([GNULIB_EXECLP])
-  GNULIB_EXECV=0;                AC_SUBST([GNULIB_EXECV])
-  GNULIB_EXECVE=0;               AC_SUBST([GNULIB_EXECVE])
-  GNULIB_EXECVP=0;               AC_SUBST([GNULIB_EXECVP])
-  GNULIB_EXECVPE=0;              AC_SUBST([GNULIB_EXECVPE])
-  GNULIB_FACCESSAT=0;            AC_SUBST([GNULIB_FACCESSAT])
-  GNULIB_FCHDIR=0;               AC_SUBST([GNULIB_FCHDIR])
-  GNULIB_FCHOWNAT=0;             AC_SUBST([GNULIB_FCHOWNAT])
-  GNULIB_FDATASYNC=0;            AC_SUBST([GNULIB_FDATASYNC])
-  GNULIB_FSYNC=0;                AC_SUBST([GNULIB_FSYNC])
-  GNULIB_FTRUNCATE=0;            AC_SUBST([GNULIB_FTRUNCATE])
-  GNULIB_GETCWD=0;               AC_SUBST([GNULIB_GETCWD])
-  GNULIB_GETDOMAINNAME=0;        AC_SUBST([GNULIB_GETDOMAINNAME])
-  GNULIB_GETDTABLESIZE=0;        AC_SUBST([GNULIB_GETDTABLESIZE])
-  GNULIB_GETENTROPY=0;           AC_SUBST([GNULIB_GETENTROPY])
-  GNULIB_GETGROUPS=0;            AC_SUBST([GNULIB_GETGROUPS])
-  GNULIB_GETHOSTNAME=0;          AC_SUBST([GNULIB_GETHOSTNAME])
-  GNULIB_GETLOGIN=0;             AC_SUBST([GNULIB_GETLOGIN])
-  GNULIB_GETLOGIN_R=0;           AC_SUBST([GNULIB_GETLOGIN_R])
-  GNULIB_GETOPT_POSIX=0;         AC_SUBST([GNULIB_GETOPT_POSIX])
-  GNULIB_GETPAGESIZE=0;          AC_SUBST([GNULIB_GETPAGESIZE])
-  GNULIB_GETPASS=0;              AC_SUBST([GNULIB_GETPASS])
-  GNULIB_GETUSERSHELL=0;         AC_SUBST([GNULIB_GETUSERSHELL])
-  GNULIB_GROUP_MEMBER=0;         AC_SUBST([GNULIB_GROUP_MEMBER])
-  GNULIB_ISATTY=0;               AC_SUBST([GNULIB_ISATTY])
-  GNULIB_LCHOWN=0;               AC_SUBST([GNULIB_LCHOWN])
-  GNULIB_LINK=0;                 AC_SUBST([GNULIB_LINK])
-  GNULIB_LINKAT=0;               AC_SUBST([GNULIB_LINKAT])
-  GNULIB_LSEEK=0;                AC_SUBST([GNULIB_LSEEK])
-  GNULIB_PIPE=0;                 AC_SUBST([GNULIB_PIPE])
-  GNULIB_PIPE2=0;                AC_SUBST([GNULIB_PIPE2])
-  GNULIB_PREAD=0;                AC_SUBST([GNULIB_PREAD])
-  GNULIB_PWRITE=0;               AC_SUBST([GNULIB_PWRITE])
-  GNULIB_READ=0;                 AC_SUBST([GNULIB_READ])
-  GNULIB_READLINK=0;             AC_SUBST([GNULIB_READLINK])
-  GNULIB_READLINKAT=0;           AC_SUBST([GNULIB_READLINKAT])
-  GNULIB_RMDIR=0;                AC_SUBST([GNULIB_RMDIR])
-  GNULIB_SETHOSTNAME=0;          AC_SUBST([GNULIB_SETHOSTNAME])
-  GNULIB_SLEEP=0;                AC_SUBST([GNULIB_SLEEP])
-  GNULIB_SYMLINK=0;              AC_SUBST([GNULIB_SYMLINK])
-  GNULIB_SYMLINKAT=0;            AC_SUBST([GNULIB_SYMLINKAT])
-  GNULIB_TRUNCATE=0;             AC_SUBST([GNULIB_TRUNCATE])
-  GNULIB_TTYNAME_R=0;            AC_SUBST([GNULIB_TTYNAME_R])
-  GNULIB_UNISTD_H_NONBLOCKING=0; AC_SUBST([GNULIB_UNISTD_H_NONBLOCKING])
-  GNULIB_UNISTD_H_SIGPIPE=0;     AC_SUBST([GNULIB_UNISTD_H_SIGPIPE])
-  GNULIB_UNLINK=0;               AC_SUBST([GNULIB_UNLINK])
-  GNULIB_UNLINKAT=0;             AC_SUBST([GNULIB_UNLINKAT])
-  GNULIB_USLEEP=0;               AC_SUBST([GNULIB_USLEEP])
-  GNULIB_WRITE=0;                AC_SUBST([GNULIB_WRITE])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_ACCESS=1;           AC_SUBST([GNULIB_MDA_ACCESS])
-  GNULIB_MDA_CHDIR=1;            AC_SUBST([GNULIB_MDA_CHDIR])
-  GNULIB_MDA_CLOSE=1;            AC_SUBST([GNULIB_MDA_CLOSE])
-  GNULIB_MDA_DUP=1;              AC_SUBST([GNULIB_MDA_DUP])
-  GNULIB_MDA_DUP2=1;             AC_SUBST([GNULIB_MDA_DUP2])
-  GNULIB_MDA_EXECL=1;            AC_SUBST([GNULIB_MDA_EXECL])
-  GNULIB_MDA_EXECLE=1;           AC_SUBST([GNULIB_MDA_EXECLE])
-  GNULIB_MDA_EXECLP=1;           AC_SUBST([GNULIB_MDA_EXECLP])
-  GNULIB_MDA_EXECV=1;            AC_SUBST([GNULIB_MDA_EXECV])
-  GNULIB_MDA_EXECVE=1;           AC_SUBST([GNULIB_MDA_EXECVE])
-  GNULIB_MDA_EXECVP=1;           AC_SUBST([GNULIB_MDA_EXECVP])
-  GNULIB_MDA_EXECVPE=1;          AC_SUBST([GNULIB_MDA_EXECVPE])
-  GNULIB_MDA_GETCWD=1;           AC_SUBST([GNULIB_MDA_GETCWD])
-  GNULIB_MDA_GETPID=1;           AC_SUBST([GNULIB_MDA_GETPID])
-  GNULIB_MDA_ISATTY=1;           AC_SUBST([GNULIB_MDA_ISATTY])
-  GNULIB_MDA_LSEEK=1;            AC_SUBST([GNULIB_MDA_LSEEK])
-  GNULIB_MDA_READ=1;             AC_SUBST([GNULIB_MDA_READ])
-  GNULIB_MDA_RMDIR=1;            AC_SUBST([GNULIB_MDA_RMDIR])
-  GNULIB_MDA_SWAB=1;             AC_SUBST([GNULIB_MDA_SWAB])
-  GNULIB_MDA_UNLINK=1;           AC_SUBST([GNULIB_MDA_UNLINK])
-  GNULIB_MDA_WRITE=1;            AC_SUBST([GNULIB_MDA_WRITE])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_CHOWN=1;           AC_SUBST([HAVE_CHOWN])
   HAVE_COPY_FILE_RANGE=1; AC_SUBST([HAVE_COPY_FILE_RANGE])
diff --git a/m4/visibility.m4 b/m4/visibility.m4
index 8f27a122d..d161bd7f7 100644
--- a/m4/visibility.m4
+++ b/m4/visibility.m4
@@ -1,4 +1,4 @@
-# visibility.m4 serial 7
+# visibility.m4 serial 8
 dnl Copyright (C) 2005, 2008, 2010-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -59,6 +59,10 @@ AC_DEFUN([gl_VISIBILITY],
               extern __attribute__((__visibility__("hidden"))) int hiddenfunc 
(void);
               extern __attribute__((__visibility__("default"))) int 
exportedfunc (void);
               void dummyfunc (void);
+              int hiddenvar;
+              int exportedvar;
+              int hiddenfunc (void) { return 51; }
+              int exportedfunc (void) { return 1225736919; }
               void dummyfunc (void) {}
             ]],
             [[]])],
diff --git a/m4/wchar_h.m4 b/m4/wchar_h.m4
index 59c55fcda..818b3192e 100644
--- a/m4/wchar_h.m4
+++ b/m4/wchar_h.m4
@@ -7,9 +7,9 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl Written by Eric Blake.
 
-# wchar_h.m4 serial 50
+# wchar_h.m4 serial 53
 
-AC_DEFUN([gl_WCHAR_H],
+AC_DEFUN_ONCE([gl_WCHAR_H],
 [
   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
   AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
@@ -125,60 +125,75 @@ Configuration aborted.])
   fi
 ])
 
+# gl_WCHAR_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_WCHAR_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_WCHAR_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_WCHAR_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_BTOWC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCTOB])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSINIT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBRTOWC])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBRLEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSRTOWCS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSNRTOWCS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCRTOMB])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSRTOMBS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNRTOMBS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCWIDTH])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMCMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMMOVE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMPCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMSET])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSLEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNLEN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCPCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCPNCPY])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCAT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCASECMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCASECMP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCOLL])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSXFRM])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSDUP])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSRCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCSPN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSSPN])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSPBRK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSSTR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSTOK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSWIDTH])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSFTIME])
+    dnl Support Microsoft deprecated alias function names by default.
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_WCSDUP], [1])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_WCHAR_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
 [
-  GNULIB_BTOWC=0;       AC_SUBST([GNULIB_BTOWC])
-  GNULIB_WCTOB=0;       AC_SUBST([GNULIB_WCTOB])
-  GNULIB_MBSINIT=0;     AC_SUBST([GNULIB_MBSINIT])
-  GNULIB_MBRTOWC=0;     AC_SUBST([GNULIB_MBRTOWC])
-  GNULIB_MBRLEN=0;      AC_SUBST([GNULIB_MBRLEN])
-  GNULIB_MBSRTOWCS=0;   AC_SUBST([GNULIB_MBSRTOWCS])
-  GNULIB_MBSNRTOWCS=0;  AC_SUBST([GNULIB_MBSNRTOWCS])
-  GNULIB_WCRTOMB=0;     AC_SUBST([GNULIB_WCRTOMB])
-  GNULIB_WCSRTOMBS=0;   AC_SUBST([GNULIB_WCSRTOMBS])
-  GNULIB_WCSNRTOMBS=0;  AC_SUBST([GNULIB_WCSNRTOMBS])
-  GNULIB_WCWIDTH=0;     AC_SUBST([GNULIB_WCWIDTH])
-  GNULIB_WMEMCHR=0;     AC_SUBST([GNULIB_WMEMCHR])
-  GNULIB_WMEMCMP=0;     AC_SUBST([GNULIB_WMEMCMP])
-  GNULIB_WMEMCPY=0;     AC_SUBST([GNULIB_WMEMCPY])
-  GNULIB_WMEMMOVE=0;    AC_SUBST([GNULIB_WMEMMOVE])
-  GNULIB_WMEMPCPY=0;    AC_SUBST([GNULIB_WMEMPCPY])
-  GNULIB_WMEMSET=0;     AC_SUBST([GNULIB_WMEMSET])
-  GNULIB_WCSLEN=0;      AC_SUBST([GNULIB_WCSLEN])
-  GNULIB_WCSNLEN=0;     AC_SUBST([GNULIB_WCSNLEN])
-  GNULIB_WCSCPY=0;      AC_SUBST([GNULIB_WCSCPY])
-  GNULIB_WCPCPY=0;      AC_SUBST([GNULIB_WCPCPY])
-  GNULIB_WCSNCPY=0;     AC_SUBST([GNULIB_WCSNCPY])
-  GNULIB_WCPNCPY=0;     AC_SUBST([GNULIB_WCPNCPY])
-  GNULIB_WCSCAT=0;      AC_SUBST([GNULIB_WCSCAT])
-  GNULIB_WCSNCAT=0;     AC_SUBST([GNULIB_WCSNCAT])
-  GNULIB_WCSCMP=0;      AC_SUBST([GNULIB_WCSCMP])
-  GNULIB_WCSNCMP=0;     AC_SUBST([GNULIB_WCSNCMP])
-  GNULIB_WCSCASECMP=0;  AC_SUBST([GNULIB_WCSCASECMP])
-  GNULIB_WCSNCASECMP=0; AC_SUBST([GNULIB_WCSNCASECMP])
-  GNULIB_WCSCOLL=0;     AC_SUBST([GNULIB_WCSCOLL])
-  GNULIB_WCSXFRM=0;     AC_SUBST([GNULIB_WCSXFRM])
-  GNULIB_WCSDUP=0;      AC_SUBST([GNULIB_WCSDUP])
-  GNULIB_WCSCHR=0;      AC_SUBST([GNULIB_WCSCHR])
-  GNULIB_WCSRCHR=0;     AC_SUBST([GNULIB_WCSRCHR])
-  GNULIB_WCSCSPN=0;     AC_SUBST([GNULIB_WCSCSPN])
-  GNULIB_WCSSPN=0;      AC_SUBST([GNULIB_WCSSPN])
-  GNULIB_WCSPBRK=0;     AC_SUBST([GNULIB_WCSPBRK])
-  GNULIB_WCSSTR=0;      AC_SUBST([GNULIB_WCSSTR])
-  GNULIB_WCSTOK=0;      AC_SUBST([GNULIB_WCSTOK])
-  GNULIB_WCSWIDTH=0;    AC_SUBST([GNULIB_WCSWIDTH])
-  GNULIB_WCSFTIME=0;    AC_SUBST([GNULIB_WCSFTIME])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_WCSDUP=1;  AC_SUBST([GNULIB_MDA_WCSDUP])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_BTOWC=1;         AC_SUBST([HAVE_BTOWC])
   HAVE_MBSINIT=1;       AC_SUBST([HAVE_MBSINIT])
diff --git a/m4/wctype_h.m4 b/m4/wctype_h.m4
index 1ab0bc985..7d7421277 100644
--- a/m4/wctype_h.m4
+++ b/m4/wctype_h.m4
@@ -1,4 +1,4 @@
-# wctype_h.m4 serial 26
+# wctype_h.m4 serial 30
 
 dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.
 
@@ -9,7 +9,7 @@ dnl with or without modifications, as long as this notice is 
preserved.
 
 dnl Written by Paul Eggert.
 
-AC_DEFUN([gl_WCTYPE_H],
+AC_DEFUN_ONCE([gl_WCTYPE_H],
 [
   AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
   AC_REQUIRE([AC_PROG_CC])
@@ -62,7 +62,7 @@ AC_DEFUN([gl_WCTYPE_H],
   fi
   AC_SUBST([HAVE_WCTYPE_H])
 
-  if test $GNULIB_OVERRIDES_WINT_T = 1; then
+  if test $GNULIBHEADERS_OVERRIDE_WINT_T = 1; then
     REPLACE_ISWCNTRL=1
   else
     case "$gl_cv_func_iswcntrl_works" in
@@ -157,24 +157,39 @@ AC_DEFUN([gl_WCTYPE_H],
     ])
 ])
 
+# gl_WCTYPE_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
 AC_DEFUN([gl_WCTYPE_MODULE_INDICATOR],
 [
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
+  dnl Ensure to expand the default settings once only.
+  gl_WCTYPE_H_REQUIRE_DEFAULTS
   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
   dnl Define it also as a C macro, for the benefit of the unit tests.
   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 ])
 
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_WCTYPE_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_WCTYPE_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWBLANK])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWDIGIT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWXDIGIT])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCTYPE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISWCTYPE])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCTRANS])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TOWCTRANS])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_WCTYPE_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
+])
+
 AC_DEFUN([gl_WCTYPE_H_DEFAULTS],
 [
-  GNULIB_ISWBLANK=0;    AC_SUBST([GNULIB_ISWBLANK])
-  GNULIB_ISWDIGIT=0;    AC_SUBST([GNULIB_ISWDIGIT])
-  GNULIB_ISWXDIGIT=0;   AC_SUBST([GNULIB_ISWXDIGIT])
-  GNULIB_WCTYPE=0;      AC_SUBST([GNULIB_WCTYPE])
-  GNULIB_ISWCTYPE=0;    AC_SUBST([GNULIB_ISWCTYPE])
-  GNULIB_WCTRANS=0;     AC_SUBST([GNULIB_WCTRANS])
-  GNULIB_TOWCTRANS=0;   AC_SUBST([GNULIB_TOWCTRANS])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_ISWBLANK=1;      AC_SUBST([HAVE_ISWBLANK])
   HAVE_WCTYPE_T=1;      AC_SUBST([HAVE_WCTYPE_T])
diff --git a/m4/wint_t.m4 b/m4/wint_t.m4
index 2fc7467f4..a49c50813 100644
--- a/m4/wint_t.m4
+++ b/m4/wint_t.m4
@@ -1,4 +1,4 @@
-# wint_t.m4 serial 10
+# wint_t.m4 serial 11
 dnl Copyright (C) 2003, 2007-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -34,14 +34,14 @@ AC_DEFUN([gt_TYPE_WINT_T],
          [gl_cv_type_wint_t_large_enough=yes],
          [gl_cv_type_wint_t_large_enough=no])])
     if test $gl_cv_type_wint_t_large_enough = no; then
-      GNULIB_OVERRIDES_WINT_T=1
+      GNULIBHEADERS_OVERRIDE_WINT_T=1
     else
-      GNULIB_OVERRIDES_WINT_T=0
+      GNULIBHEADERS_OVERRIDE_WINT_T=0
     fi
   else
-    GNULIB_OVERRIDES_WINT_T=0
+    GNULIBHEADERS_OVERRIDE_WINT_T=0
   fi
-  AC_SUBST([GNULIB_OVERRIDES_WINT_T])
+  AC_SUBST([GNULIBHEADERS_OVERRIDE_WINT_T])
 ])
 
 dnl Prerequisites of the 'wint_t' override.
diff --git a/m4/year2038.m4 b/m4/year2038.m4
new file mode 100644
index 000000000..f53b03f94
--- /dev/null
+++ b/m4/year2038.m4
@@ -0,0 +1,124 @@
+# year2038.m4 serial 6
+dnl Copyright (C) 2017-2021 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Attempt to ensure that 'time_t' can go past the year 2038 and that
+dnl the functions 'time', 'stat', etc. work with post-2038 timestamps.
+
+AC_DEFUN([gl_YEAR2038_EARLY],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  case "$host_os" in
+    mingw*)
+      AC_DEFINE([__MINGW_USE_VC2005_COMPAT], [1],
+        [For 64-bit time_t on 32-bit mingw.])
+      ;;
+  esac
+])
+
+# gl_YEAR2038_TEST_INCLUDES
+# -------------------------
+AC_DEFUN([gl_YEAR2038_TEST_INCLUDES],
+[[
+  #include <time.h>
+  /* Check that time_t can represent 2**32 - 1 correctly.  */
+  #define LARGE_TIME_T \\
+    ((time_t) (((time_t) 1 << 30) - 1 + 3 * ((time_t) 1 << 30)))
+  int verify_time_t_range[(LARGE_TIME_T / 65537 == 65535
+                           && LARGE_TIME_T % 65537 == 0)
+                          ? 1 : -1];
+]])
+
+# gl_YEAR2038_BODY(REQUIRE-YEAR2038-SAFE)
+-----------------------------------------
+AC_DEFUN([gl_YEAR2038_BODY],
+[
+ AC_ARG_ENABLE([year2038],
+   [  --disable-year2038      omit support for timestamps past the year 2038])
+ AS_IF([test "$enable_year2038" != no],
+ [
+  dnl On many systems, time_t is already a 64-bit type.
+  dnl On those systems where time_t is still 32-bit, it requires kernel
+  dnl and libc support to make it 64-bit. For glibc 2.34 and later on Linux,
+  dnl defining _TIME_BITS=64 and _FILE_OFFSET_BITS=64 is needed on x86 and ARM.
+  dnl
+  dnl On native Windows, the system include files define types __time32_t
+  dnl and __time64_t. By default, time_t is an alias of
+  dnl   - __time32_t on 32-bit mingw,
+  dnl   - __time64_t on 64-bit mingw and on MSVC (since MSVC 8).
+  dnl But when compiling with -D__MINGW_USE_VC2005_COMPAT, time_t is an
+  dnl alias of __time64_t.
+  dnl And when compiling with -D_USE_32BIT_TIME_T, time_t is an alias of
+  dnl __time32_t.
+  AC_CACHE_CHECK([for time_t past the year 2038], [gl_cv_type_time_t_y2038],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_SOURCE([gl_YEAR2038_TEST_INCLUDES])],
+       [gl_cv_type_time_t_y2038=yes], [gl_cv_type_time_t_y2038=no])
+    ])
+  if test "$gl_cv_type_time_t_y2038" = no; then
+    AC_CACHE_CHECK([for 64-bit time_t with _TIME_BITS=64],
+      [gl_cv_type_time_t_bits_macro],
+      [AC_COMPILE_IFELSE(
+         [AC_LANG_SOURCE([[#define _TIME_BITS 64
+                           #define _FILE_OFFSET_BITS 64
+                           ]gl_YEAR2038_TEST_INCLUDES])],
+         [gl_cv_type_time_t_bits_macro=yes],
+         [gl_cv_type_time_t_bits_macro=no])
+      ])
+    if test "$gl_cv_type_time_t_bits_macro" = yes; then
+      AC_DEFINE([_TIME_BITS], [64],
+        [Number of bits in a timestamp, on hosts where this is settable.])
+      dnl AC_SYS_LARGFILE also defines this; it's OK if we do too.
+      AC_DEFINE([_FILE_OFFSET_BITS], [64],
+        [Number of bits in a file offset, on hosts where this is settable.])
+      gl_cv_type_time_t_y2038=yes
+    fi
+  fi
+  if test $gl_cv_type_time_t_y2038 = no; then
+    AC_COMPILE_IFELSE(
+      [AC_LANG_SOURCE(
+         [[#ifdef _USE_32BIT_TIME_T
+             int ok;
+           #else
+             error fail
+           #endif
+         ]])],
+      [AC_MSG_FAILURE(
+         [The 'time_t' type stops working after January 2038.
+          Remove _USE_32BIT_TIME_T from the compiler flags.])],
+      [# If not cross-compiling and $1 says we should check,
+       # and 'touch' works with a large timestamp, then evidently wider time_t
+       # is desired and supported, so fail and ask the builder to fix the
+       # problem.  Otherwise, just warn the builder.
+       m4_ifval([$1],
+         [if test $cross_compiling = no \
+             && TZ=UTC0 touch -t 210602070628.15 conftest.time 2>/dev/null; 
then
+            case `TZ=UTC0 LC_ALL=C ls -l conftest.time 2>/dev/null` in
+              *'Feb  7  2106'* | *'Feb  7 17:10'*)
+                AC_MSG_FAILURE(
+                  [The 'time_t' type stops working after January 2038,
+                   and your system appears to support a wider 'time_t'.
+                   Try configuring with 'CPPFLAGS="-m64" LDFLAGS="-m64"'.
+                   To build with a 32-bit time_t anyway (not recommended),
+                   configure with '--disable-year2038'.]);;
+            esac
+            rm -f conftest.time
+          fi])
+       if test "$gl_warned_about_y2038" != yes; then
+         AC_MSG_WARN(
+           [The 'time_t' type stops working after January 2038,
+            and this package needs a wider 'time_t' type
+            if there is any way to access timestamps after that.
+            Configure with 'CPPFLAGS="-m64" LDFLAGS="-m64"' perhaps?])
+         gl_warned_about_y2038=yes
+       fi
+      ])
+  fi])
+])
+
+AC_DEFUN([gl_YEAR2038],
+[
+  gl_YEAR2038_BODY([require-year2038-safe])
+])
diff --git a/maint.mk b/maint.mk
index ae3a8170a..6a3ea9606 100644
--- a/maint.mk
+++ b/maint.mk
@@ -1409,7 +1409,7 @@ announcement_mail_headers_alpha =         \
 announcement_mail_Cc_beta = $(announcement_mail_Cc_alpha)
 announcement_mail_headers_beta = $(announcement_mail_headers_alpha)
 
-announcement_mail_Cc_ ?= $(announcement_mail_Cc_$(release-type))
+announcement_Cc_ ?= $(announcement_Cc_$(release-type))
 announcement_mail_headers_ ?= $(announcement_mail_headers_$(release-type))
 announcement: NEWS ChangeLog $(rel-files)
 # Not $(AM_V_GEN) since the output of this command serves as
@@ -1426,7 +1426,6 @@ announcement: NEWS ChangeLog $(rel-files)
            --bootstrap-tools=$(bootstrap-tools)                        \
            $$(case ,$(bootstrap-tools), in (*,gnulib,*)                \
               echo --gnulib-version=$(gnulib-version);; esac)          \
-           --no-print-checksums                                        \
            $(addprefix --url-dir=, $(url_dir_list))
 
 .PHONY: release-commit
-- 
2.32.0

>From ce997aa3a11ef8a9470e4d39cacf67d3893d8c38 Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Wed, 4 Aug 2021 01:04:39 +0200
Subject: [PATCH 2/4] gnulib: import wcwidth

---
 lib/Makefile.am         |  40 +++-
 lib/uniwidth.in.h       |  72 +++++++
 lib/uniwidth/cjk.h      |  37 ++++
 lib/uniwidth/width.c    | 468 ++++++++++++++++++++++++++++++++++++++++
 lib/wcwidth.c           |  73 +++++++
 m4/gnulib-cache.m4      |   4 +-
 m4/gnulib-comp.m4       |  31 ++-
 m4/libunistring-base.m4 | 141 ++++++++++++
 m4/wcwidth.m4           | 115 ++++++++++
 9 files changed, 966 insertions(+), 15 deletions(-)
 create mode 100644 lib/uniwidth.in.h
 create mode 100644 lib/uniwidth/cjk.h
 create mode 100644 lib/uniwidth/width.c
 create mode 100644 lib/wcwidth.c
 create mode 100644 m4/libunistring-base.m4
 create mode 100644 m4/wcwidth.m4

diff --git a/lib/Makefile.am b/lib/Makefile.am
index cb29c3136..be2a54569 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -136,7 +136,8 @@
 #  verify \
 #  vsnprintf \
 #  warnings \
-#  wchar
+#  wchar \
+#  wcwidth
 
 AUTOMAKE_OPTIONS = 1.11 gnits subdir-objects
 
@@ -2787,9 +2788,7 @@ EXTRA_libgnu_la_SOURCES += strdup.c
 
 ## begin gnulib module streq
 
-if gl_GNULIB_ENABLED_streq
 
-endif
 EXTRA_DIST += streq.h
 
 ## end   gnulib module streq
@@ -3588,6 +3587,32 @@ EXTRA_DIST += unistd.in.h
 
 ## end   gnulib module unistd
 
+## begin gnulib module uniwidth/base
+
+BUILT_SOURCES += $(LIBUNISTRING_UNIWIDTH_H)
+
+uniwidth.h: uniwidth.in.h
+       $(AM_V_GEN)rm -f $@-t $@ && \
+       { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
+         cat $(srcdir)/uniwidth.in.h; \
+       } > $@-t && \
+       mv -f $@-t $@
+MOSTLYCLEANFILES += uniwidth.h uniwidth.h-t
+
+EXTRA_DIST += localcharset.h uniwidth.in.h
+
+## end   gnulib module uniwidth/base
+
+## begin gnulib module uniwidth/width
+
+if LIBUNISTRING_COMPILE_UNIWIDTH_WIDTH
+libgnu_la_SOURCES += uniwidth/width.c
+endif
+
+EXTRA_DIST += uniwidth/cjk.h
+
+## end   gnulib module uniwidth/width
+
 ## begin gnulib module unsetenv
 
 if gl_GNULIB_ENABLED_unsetenv
@@ -3830,6 +3855,15 @@ EXTRA_DIST += wctype.in.h
 
 ## end   gnulib module wctype-h
 
+## begin gnulib module wcwidth
+
+
+EXTRA_DIST += wcwidth.c
+
+EXTRA_libgnu_la_SOURCES += wcwidth.c
+
+## end   gnulib module wcwidth
+
 ## begin gnulib module write
 
 
diff --git a/lib/uniwidth.in.h b/lib/uniwidth.in.h
new file mode 100644
index 000000000..0859254ef
--- /dev/null
+++ b/lib/uniwidth.in.h
@@ -0,0 +1,72 @@
+/* Display width functions.
+   Copyright (C) 2001-2002, 2005, 2007, 2009-2021 Free Software Foundation,
+   Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#ifndef _UNIWIDTH_H
+#define _UNIWIDTH_H
+
+#include "unitypes.h"
+
+/* Get size_t.  */
+#include <stddef.h>
+
+/* Get locale_charset() declaration.  */
+#include "localcharset.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Display width.  */
+
+/* These functions are locale dependent.  The encoding argument identifies
+   the encoding (e.g. "ISO-8859-2" for Polish).  */
+
+/* Determine number of column positions required for UC.  */
+extern int
+       uc_width (ucs4_t uc, const char *encoding)
+       _UC_ATTRIBUTE_PURE;
+
+/* Determine number of column positions required for first N units
+   (or fewer if S ends before this) in S.  */
+extern int
+       u8_width (const uint8_t *s, size_t n, const char *encoding)
+       _UC_ATTRIBUTE_PURE;
+extern int
+       u16_width (const uint16_t *s, size_t n, const char *encoding)
+       _UC_ATTRIBUTE_PURE;
+extern int
+       u32_width (const uint32_t *s, size_t n, const char *encoding)
+       _UC_ATTRIBUTE_PURE;
+
+/* Determine number of column positions required for S.  */
+extern int
+       u8_strwidth (const uint8_t *s, const char *encoding)
+       _UC_ATTRIBUTE_PURE;
+extern int
+       u16_strwidth (const uint16_t *s, const char *encoding)
+       _UC_ATTRIBUTE_PURE;
+extern int
+       u32_strwidth (const uint32_t *s, const char *encoding)
+       _UC_ATTRIBUTE_PURE;
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UNIWIDTH_H */
diff --git a/lib/uniwidth/cjk.h b/lib/uniwidth/cjk.h
new file mode 100644
index 000000000..1853ceb9d
--- /dev/null
+++ b/lib/uniwidth/cjk.h
@@ -0,0 +1,37 @@
+/* Test for CJK encoding.
+   Copyright (C) 2001-2002, 2005-2007, 2009-2021 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include "streq.h"
+
+static int
+is_cjk_encoding (const char *encoding)
+{
+  if (0
+      /* Legacy Japanese encodings */
+      || STREQ_OPT (encoding, "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0)
+      /* Legacy Chinese encodings */
+      || STREQ_OPT (encoding, "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
+      || STREQ_OPT (encoding, "GBK", 'G', 'B', 'K', 0, 0, 0, 0, 0, 0)
+      || STREQ_OPT (encoding, "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0)
+      || STREQ_OPT (encoding, "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0)
+      /* Legacy Korean encodings */
+      || STREQ_OPT (encoding, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
+      || STREQ_OPT (encoding, "CP949", 'C', 'P', '9', '4', '9', 0, 0, 0, 0)
+      || STREQ_OPT (encoding, "JOHAB", 'J', 'O', 'H', 'A', 'B', 0, 0, 0, 0))
+    return 1;
+  return 0;
+}
diff --git a/lib/uniwidth/width.c b/lib/uniwidth/width.c
new file mode 100644
index 000000000..9ba07d331
--- /dev/null
+++ b/lib/uniwidth/width.c
@@ -0,0 +1,468 @@
+/* Determine display width of Unicode character.
+   Copyright (C) 2001-2002, 2006-2021 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "uniwidth.h"
+
+#include "cjk.h"
+
+/*
+ * Non-spacing attribute table.
+ * Consists of:
+ * - Non-spacing characters; generated from PropList.txt or
+ *   "grep '^[^;]*;[^;]*;[^;]*;[^;]*;NSM;' UnicodeData.txt"
+ * - Format control characters; generated from
+ *   "grep '^[^;]*;[^;]*;Cf;' UnicodeData.txt"
+ * - Zero width characters; generated from
+ *   "grep '^[^;]*;ZERO WIDTH ' UnicodeData.txt"
+ */
+static const unsigned char nonspacing_table_data[38*64] = {
+  /* 0x0000-0x01ff */
+  0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, /* 0x0000-0x003f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, /* 0x0040-0x007f */
+  0xff, 0xff, 0xff, 0xff, 0x00, 0x20, 0x00, 0x00, /* 0x0080-0x00bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x00c0-0x00ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0100-0x013f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0140-0x017f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0180-0x01bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01c0-0x01ff */
+  /* 0x0200-0x03ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0200-0x023f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0240-0x027f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0280-0x02bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02c0-0x02ff */
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x0300-0x033f */
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, /* 0x0340-0x037f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0380-0x03bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x03c0-0x03ff */
+  /* 0x0400-0x05ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0400-0x043f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0440-0x047f */
+  0xf8, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0480-0x04bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x04c0-0x04ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0500-0x053f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0540-0x057f */
+  0x00, 0x00, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xbf, /* 0x0580-0x05bf */
+  0xb6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x05c0-0x05ff */
+  /* 0x0600-0x07ff */
+  0x3f, 0x00, 0xff, 0x17, 0x00, 0x00, 0x00, 0x00, /* 0x0600-0x063f */
+  0x00, 0xf8, 0xff, 0xff, 0x00, 0x00, 0x01, 0x00, /* 0x0640-0x067f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0680-0x06bf */
+  0x00, 0x00, 0xc0, 0xbf, 0x9f, 0x3d, 0x00, 0x00, /* 0x06c0-0x06ff */
+  0x00, 0x80, 0x02, 0x00, 0x00, 0x00, 0xff, 0xff, /* 0x0700-0x073f */
+  0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0740-0x077f */
+  0x00, 0x00, 0x00, 0x00, 0xc0, 0xff, 0x01, 0x00, /* 0x0780-0x07bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x0f, 0x00, /* 0x07c0-0x07ff */
+  /* 0x0800-0x09ff */
+  0x00, 0x00, 0xc0, 0xfb, 0xef, 0x3e, 0x00, 0x00, /* 0x0800-0x083f */
+  0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x00, /* 0x0840-0x087f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0880-0x08bf */
+  0x00, 0x00, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x08c0-0x08ff */
+  0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14, /* 0x0900-0x093f */
+  0xfe, 0x21, 0xfe, 0x00, 0x0c, 0x00, 0x00, 0x00, /* 0x0940-0x097f */
+  0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, /* 0x0980-0x09bf */
+  0x1e, 0x20, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, /* 0x09c0-0x09ff */
+  /* 0x0a00-0x0bff */
+  0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, /* 0x0a00-0x0a3f */
+  0x86, 0x39, 0x02, 0x00, 0x00, 0x00, 0x23, 0x00, /* 0x0a40-0x0a7f */
+  0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, /* 0x0a80-0x0abf */
+  0xbe, 0x21, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, /* 0x0ac0-0x0aff */
+  0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x90, /* 0x0b00-0x0b3f */
+  0x1e, 0x20, 0x40, 0x00, 0x0c, 0x00, 0x00, 0x00, /* 0x0b40-0x0b7f */
+  0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0b80-0x0bbf */
+  0x01, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0bc0-0x0bff */
+  /* 0x0c00-0x0dff */
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, /* 0x0c00-0x0c3f */
+  0xc1, 0x3d, 0x60, 0x00, 0x0c, 0x00, 0x00, 0x00, /* 0x0c40-0x0c7f */
+  0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, /* 0x0c80-0x0cbf */
+  0x00, 0x30, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, /* 0x0cc0-0x0cff */
+  0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0d00-0x0d3f */
+  0x1e, 0x20, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, /* 0x0d40-0x0d7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0d80-0x0dbf */
+  0x00, 0x04, 0x5c, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0dc0-0x0dff */
+  /* 0x0e00-0x0fff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x07, /* 0x0e00-0x0e3f */
+  0x80, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0e40-0x0e7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x1b, /* 0x0e80-0x0ebf */
+  0x00, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0ec0-0x0eff */
+  0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0xa0, 0x02, /* 0x0f00-0x0f3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x7f, /* 0x0f40-0x0f7f */
+  0xdf, 0xe0, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x1f, /* 0x0f80-0x0fbf */
+  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0fc0-0x0fff */
+  /* 0x1000-0x11ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0xfd, 0x66, /* 0x1000-0x103f */
+  0x00, 0x00, 0x00, 0xc3, 0x01, 0x00, 0x1e, 0x00, /* 0x1040-0x107f */
+  0x64, 0x20, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, /* 0x1080-0x10bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10c0-0x10ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1100-0x113f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1140-0x117f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1180-0x11bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11c0-0x11ff */
+  /* 0x1200-0x13ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1200-0x123f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1240-0x127f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1280-0x12bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x12c0-0x12ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1300-0x133f */
+  0x00, 0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, /* 0x1340-0x137f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1380-0x13bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x13c0-0x13ff */
+  /* 0x1600-0x17ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1600-0x163f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1640-0x167f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1680-0x16bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16c0-0x16ff */
+  0x00, 0x00, 0x1c, 0x00, 0x00, 0x00, 0x1c, 0x00, /* 0x1700-0x173f */
+  0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x0c, 0x00, /* 0x1740-0x177f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb0, 0x3f, /* 0x1780-0x17bf */
+  0x40, 0xfe, 0x0f, 0x20, 0x00, 0x00, 0x00, 0x00, /* 0x17c0-0x17ff */
+  /* 0x1800-0x19ff */
+  0x00, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1800-0x183f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1840-0x187f */
+  0x60, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, /* 0x1880-0x18bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x18c0-0x18ff */
+  0x00, 0x00, 0x00, 0x00, 0x87, 0x01, 0x04, 0x0e, /* 0x1900-0x193f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1940-0x197f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1980-0x19bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x19c0-0x19ff */
+  /* 0x1a00-0x1bff */
+  0x00, 0x00, 0x80, 0x09, 0x00, 0x00, 0x00, 0x00, /* 0x1a00-0x1a3f */
+  0x00, 0x00, 0x40, 0x7f, 0xe5, 0x1f, 0xf8, 0x9f, /* 0x1a40-0x1a7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x7f, /* 0x1a80-0x1abf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1ac0-0x1aff */
+  0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0xd0, 0x17, /* 0x1b00-0x1b3f */
+  0x04, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x0f, 0x00, /* 0x1b40-0x1b7f */
+  0x03, 0x00, 0x00, 0x00, 0x3c, 0x3b, 0x00, 0x00, /* 0x1b80-0x1bbf */
+  0x00, 0x00, 0x00, 0x00, 0x40, 0xa3, 0x03, 0x00, /* 0x1bc0-0x1bff */
+  /* 0x1c00-0x1dff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0xcf, 0x00, /* 0x1c00-0x1c3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1c40-0x1c7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1c80-0x1cbf */
+  0x00, 0x00, 0xf7, 0xff, 0xfd, 0x21, 0x10, 0x03, /* 0x1cc0-0x1cff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d00-0x1d3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d40-0x1d7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d80-0x1dbf */
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xf8, /* 0x1dc0-0x1dff */
+  /* 0x2000-0x21ff */
+  0x00, 0xf8, 0x00, 0x00, 0x00, 0x7c, 0x00, 0x00, /* 0x2000-0x203f */
+  0x00, 0x00, 0x00, 0x00, 0xdf, 0xff, 0x00, 0x00, /* 0x2040-0x207f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2080-0x20bf */
+  0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x00, /* 0x20c0-0x20ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2100-0x213f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2140-0x217f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2180-0x21bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x21c0-0x21ff */
+  /* 0x2c00-0x2dff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2c00-0x2c3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2c40-0x2c7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2c80-0x2cbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x03, 0x00, /* 0x2cc0-0x2cff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2d00-0x2d3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, /* 0x2d40-0x2d7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x2d80-0x2dbf */
+  0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, /* 0x2dc0-0x2dff */
+  /* 0x3000-0x31ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, /* 0x3000-0x303f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x3040-0x307f */
+  0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, /* 0x3080-0x30bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x30c0-0x30ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x3100-0x313f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x3140-0x317f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x3180-0x31bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x31c0-0x31ff */
+  /* 0xa600-0xa7ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa600-0xa63f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xf7, 0x3f, /* 0xa640-0xa67f */
+  0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00, /* 0xa680-0xa6bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, /* 0xa6c0-0xa6ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa700-0xa73f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa740-0xa77f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa780-0xa7bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa7c0-0xa7ff */
+  /* 0xa800-0xa9ff */
+  0x44, 0x08, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, /* 0xa800-0xa83f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa840-0xa87f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa880-0xa8bf */
+  0x30, 0x00, 0x00, 0x00, 0xff, 0xff, 0x03, 0x00, /* 0xa8c0-0xa8ff */
+  0x00, 0x00, 0x00, 0x00, 0xc0, 0x3f, 0x00, 0x00, /* 0xa900-0xa93f */
+  0x80, 0xff, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa940-0xa97f */
+  0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc8, 0x13, /* 0xa980-0xa9bf */
+  0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, /* 0xa9c0-0xa9ff */
+  /* 0xaa00-0xabff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x66, 0x00, /* 0xaa00-0xaa3f */
+  0x08, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, /* 0xaa40-0xaa7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x9d, 0xc1, /* 0xaa80-0xaabf */
+  0x02, 0x00, 0x00, 0x00, 0x00, 0x30, 0x40, 0x00, /* 0xaac0-0xaaff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xab00-0xab3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xab40-0xab7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xab80-0xabbf */
+  0x00, 0x00, 0x00, 0x00, 0x20, 0x21, 0x00, 0x00, /* 0xabc0-0xabff */
+  /* 0xfa00-0xfbff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfa00-0xfa3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfa40-0xfa7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfa80-0xfabf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfac0-0xfaff */
+  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, /* 0xfb00-0xfb3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfb40-0xfb7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfb80-0xfbbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfbc0-0xfbff */
+  /* 0xfe00-0xffff */
+  0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, /* 0xfe00-0xfe3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfe40-0xfe7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xfe80-0xfebf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, /* 0xfec0-0xfeff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xff00-0xff3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xff40-0xff7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xff80-0xffbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0e, /* 0xffc0-0xffff */
+  /* 0x10000-0x101ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10000-0x1003f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10040-0x1007f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10080-0x100bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x100c0-0x100ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10100-0x1013f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10140-0x1017f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10180-0x101bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, /* 0x101c0-0x101ff */
+  /* 0x10200-0x103ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10200-0x1023f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10240-0x1027f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10280-0x102bf */
+  0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, /* 0x102c0-0x102ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10300-0x1033f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x07, /* 0x10340-0x1037f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10380-0x103bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x103c0-0x103ff */
+  /* 0x10a00-0x10bff */
+  0x6e, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87, /* 0x10a00-0x10a3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10a40-0x10a7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10a80-0x10abf */
+  0x00, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, /* 0x10ac0-0x10aff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10b00-0x10b3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10b40-0x10b7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10b80-0x10bbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10bc0-0x10bff */
+  /* 0x11000-0x111ff */
+  0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, /* 0x11000-0x1103f */
+  0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, /* 0x11040-0x1107f */
+  0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x26, /* 0x11080-0x110bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x110c0-0x110ff */
+  0x07, 0x00, 0x00, 0x00, 0x80, 0xef, 0x1f, 0x00, /* 0x11100-0x1113f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, /* 0x11140-0x1117f */
+  0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x7f, /* 0x11180-0x111bf */
+  0x00, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x111c0-0x111ff */
+  /* 0x11200-0x113ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xd3, 0x40, /* 0x11200-0x1123f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11240-0x1127f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11280-0x112bf */
+  0x00, 0x00, 0x00, 0x80, 0xf8, 0x07, 0x00, 0x00, /* 0x112c0-0x112ff */
+  0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, /* 0x11300-0x1133f */
+  0x01, 0x00, 0x00, 0x00, 0xc0, 0x1f, 0x1f, 0x00, /* 0x11340-0x1137f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11380-0x113bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x113c0-0x113ff */
+  /* 0x11400-0x115ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, /* 0x11400-0x1143f */
+  0x5c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11440-0x1147f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x85, /* 0x11480-0x114bf */
+  0x0d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x114c0-0x114ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11500-0x1153f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11540-0x1157f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0xb0, /* 0x11580-0x115bf */
+  0x01, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, /* 0x115c0-0x115ff */
+  /* 0x11600-0x117ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0xa7, /* 0x11600-0x1163f */
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11640-0x1167f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0xbf, 0x00, /* 0x11680-0x116bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x116c0-0x116ff */
+  0x00, 0x00, 0x00, 0xe0, 0xbc, 0x0f, 0x00, 0x00, /* 0x11700-0x1173f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11740-0x1177f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11780-0x117bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x117c0-0x117ff */
+  /* 0x11c00-0x11dff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x3f, /* 0x11c00-0x11c3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11c40-0x11c7f */
+  0x00, 0x00, 0xfc, 0xff, 0xff, 0xfc, 0x6d, 0x00, /* 0x11c80-0x11cbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11cc0-0x11cff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11d00-0x11d3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11d40-0x11d7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11d80-0x11dbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x11dc0-0x11dff */
+  /* 0x16a00-0x16bff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16a00-0x16a3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16a40-0x16a7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16a80-0x16abf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x00, /* 0x16ac0-0x16aff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x00, /* 0x16b00-0x16b3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16b40-0x16b7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16b80-0x16bbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16bc0-0x16bff */
+  /* 0x16e00-0x16fff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16e00-0x16e3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16e40-0x16e7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16e80-0x16ebf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16ec0-0x16eff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16f00-0x16f3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16f40-0x16f7f */
+  0x00, 0x80, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16f80-0x16fbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x16fc0-0x16fff */
+  /* 0x1bc00-0x1bdff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1bc00-0x1bc3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1bc40-0x1bc7f */
+  0x00, 0x00, 0x00, 0x60, 0x0f, 0x00, 0x00, 0x00, /* 0x1bc80-0x1bcbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1bcc0-0x1bcff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1bd00-0x1bd3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1bd40-0x1bd7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1bd80-0x1bdbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1bdc0-0x1bdff */
+  /* 0x1d000-0x1d1ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d000-0x1d03f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d040-0x1d07f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d080-0x1d0bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d0c0-0x1d0ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d100-0x1d13f */
+  0x00, 0x00, 0x00, 0x00, 0x80, 0x03, 0xf8, 0xff, /* 0x1d140-0x1d17f */
+  0xe7, 0x0f, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, /* 0x1d180-0x1d1bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d1c0-0x1d1ff */
+  /* 0x1d200-0x1d3ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d200-0x1d23f */
+  0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d240-0x1d27f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d280-0x1d2bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d2c0-0x1d2ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d300-0x1d33f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d340-0x1d37f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d380-0x1d3bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1d3c0-0x1d3ff */
+  /* 0x1da00-0x1dbff */
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xf8, /* 0x1da00-0x1da3f */
+  0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x20, 0x00, /* 0x1da40-0x1da7f */
+  0x10, 0x00, 0x00, 0xf8, 0xfe, 0xff, 0x00, 0x00, /* 0x1da80-0x1dabf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1dac0-0x1daff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1db00-0x1db3f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1db40-0x1db7f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1db80-0x1dbbf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1dbc0-0x1dbff */
+  /* 0x1e000-0x1e1ff */
+  0x7f, 0xff, 0xff, 0xf9, 0xdb, 0x07, 0x00, 0x00, /* 0x1e000-0x1e03f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e040-0x1e07f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e080-0x1e0bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e0c0-0x1e0ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e100-0x1e13f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e140-0x1e17f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e180-0x1e1bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e1c0-0x1e1ff */
+  /* 0x1e800-0x1e9ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e800-0x1e83f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e840-0x1e87f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e880-0x1e8bf */
+  0x00, 0x00, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e8c0-0x1e8ff */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e900-0x1e93f */
+  0xf0, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e940-0x1e97f */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x1e980-0x1e9bf */
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00  /* 0x1e9c0-0x1e9ff */
+};
+static const signed char nonspacing_table_ind[248] = {
+   0,  1,  2,  3,  4,  5,  6,  7, /* 0x0000-0x0fff */
+   8,  9, -1, 10, 11, 12, 13, -1, /* 0x1000-0x1fff */
+  14, -1, -1, -1, -1, -1, 15, -1, /* 0x2000-0x2fff */
+  16, -1, -1, -1, -1, -1, -1, -1, /* 0x3000-0x3fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x4000-0x4fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x5000-0x5fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x6000-0x6fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x7000-0x7fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x8000-0x8fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x9000-0x9fff */
+  -1, -1, -1, 17, 18, 19, -1, -1, /* 0xa000-0xafff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0xb000-0xbfff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0xc000-0xcfff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0xd000-0xdfff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0xe000-0xefff */
+  -1, -1, -1, -1, -1, 20, -1, 21, /* 0xf000-0xffff */
+  22, 23, -1, -1, -1, 24, -1, -1, /* 0x10000-0x10fff */
+  25, 26, 27, 28, -1, -1, 29, -1, /* 0x11000-0x11fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x12000-0x12fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x13000-0x13fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x14000-0x14fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x15000-0x15fff */
+  -1, -1, -1, -1, -1, 30, -1, 31, /* 0x16000-0x16fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x17000-0x17fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x18000-0x18fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x19000-0x19fff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x1a000-0x1afff */
+  -1, -1, -1, -1, -1, -1, 32, -1, /* 0x1b000-0x1bfff */
+  -1, -1, -1, -1, -1, -1, -1, -1, /* 0x1c000-0x1cfff */
+  33, 34, -1, -1, -1, 35, -1, -1, /* 0x1d000-0x1dfff */
+  36, -1, -1, -1, 37, -1, -1, -1  /* 0x1e000-0x1efff */
+};
+
+/* Determine number of column positions required for UC.  */
+int
+uc_width (ucs4_t uc, const char *encoding)
+{
+  /* Test for non-spacing or control character.  */
+  if ((uc >> 9) < 248)
+    {
+      int ind = nonspacing_table_ind[uc >> 9];
+      if (ind >= 0)
+        if ((nonspacing_table_data[64*ind + ((uc >> 3) & 63)] >> (uc & 7)) & 1)
+          {
+            if (uc > 0 && uc < 0xa0)
+              return -1;
+            else
+              return 0;
+          }
+    }
+  else if ((uc >> 9) == (0xe0000 >> 9))
+    {
+      if (uc >= 0xe0100)
+        {
+          if (uc <= 0xe01ef)
+            return 0;
+        }
+      else
+        {
+          if (uc >= 0xe0020 ? uc <= 0xe007f : uc == 0xe0001)
+            return 0;
+        }
+    }
+  /* Test for double-width character.
+   * Generated from "grep '^[^;]\{4,5\};[WF]' EastAsianWidth.txt"
+   * and            "grep '^[^;]\{4,5\};[^WF]' EastAsianWidth.txt"
+   */
+  if (uc >= 0x1100
+      && ((uc < 0x1160) /* Hangul Jamo */
+          || (uc >= 0x2329 && uc < 0x232b) /* Angle Brackets */
+          || (uc >= 0x2e80 && uc < 0xa4d0  /* CJK ... Yi */
+              && !(uc == 0x303f) && !(uc >= 0x4dc0 && uc < 0x4e00))
+          || (uc >= 0xac00 && uc < 0xd7a4) /* Hangul Syllables */
+          || (uc >= 0xf900 && uc < 0xfb00) /* CJK Compatibility Ideographs */
+          || (uc >= 0xfe10 && uc < 0xfe20) /* Presentation Forms for Vertical 
*/
+          || (uc >= 0xfe30 && uc < 0xfe70) /* CJK Compatibility Forms */
+          || (uc >= 0xff00 && uc < 0xff61) /* Fullwidth Forms */
+          || (uc >= 0xffe0 && uc < 0xffe7) /* Fullwidth Signs */
+          || (uc >= 0x20000 && uc <= 0x2ffff) /* Supplementary Ideographic 
Plane */
+          || (uc >= 0x30000 && uc <= 0x3ffff) /* Tertiary Ideographic Plane */
+     )   )
+    return 2;
+  /* In ancient CJK encodings, Cyrillic and most other characters are
+     double-width as well.  */
+  if (uc >= 0x00A1 && uc < 0xFF61 && uc != 0x20A9
+      && is_cjk_encoding (encoding))
+    return 2;
+  return 1;
+}
diff --git a/lib/wcwidth.c b/lib/wcwidth.c
new file mode 100644
index 000000000..7f11211dd
--- /dev/null
+++ b/lib/wcwidth.c
@@ -0,0 +1,73 @@
+/* Determine the number of screen columns needed for a character.
+   Copyright (C) 2006-2007, 2010-2021 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <wchar.h>
+
+/* Get iswprint.  */
+#include <wctype.h>
+
+#include "localcharset.h"
+#include "streq.h"
+#include "uniwidth.h"
+
+/* Returns 1 if the current locale is an UTF-8 locale, 0 otherwise.  */
+static inline int
+is_locale_utf8 (void)
+{
+  const char *encoding = locale_charset ();
+  return STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0);
+}
+
+#if GNULIB_WCHAR_SINGLE_LOCALE
+/* When we know that the locale does not change, provide a speedup by
+   caching the value of is_locale_utf8.  */
+static int cached_is_locale_utf8 = -1;
+static inline int
+is_locale_utf8_cached (void)
+{
+  if (cached_is_locale_utf8 < 0)
+    cached_is_locale_utf8 = is_locale_utf8 ();
+  return cached_is_locale_utf8;
+}
+#else
+/* By default, don't make assumptions, hence no caching.  */
+# define is_locale_utf8_cached is_locale_utf8
+#endif
+
+int
+wcwidth (wchar_t wc)
+#undef wcwidth
+{
+  /* In UTF-8 locales, use a Unicode aware width function.  */
+  if (is_locale_utf8_cached ())
+    {
+      /* We assume that in a UTF-8 locale, a wide character is the same as a
+         Unicode character.  */
+      return uc_width (wc, "UTF-8");
+    }
+  else
+    {
+      /* Otherwise, fall back to the system's wcwidth function.  */
+#if HAVE_WCWIDTH
+      return wcwidth (wc);
+#else
+      return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
+#endif
+    }
+}
diff --git a/m4/gnulib-cache.m4 b/m4/gnulib-cache.m4
index 841bd6140..aeb671cd1 100644
--- a/m4/gnulib-cache.m4
+++ b/m4/gnulib-cache.m4
@@ -141,7 +141,8 @@
 #  verify \
 #  vsnprintf \
 #  warnings \
-#  wchar
+#  wchar \
+#  wcwidth
 
 # Specification in the form of a few gnulib-tool.m4 macro invocations:
 gl_LOCAL_DIR([gnulib-local])
@@ -241,6 +242,7 @@ gl_MODULES([
   vsnprintf
   warnings
   wchar
+  wcwidth
 ])
 gl_AVOID([lock unistr/base unistr/u8-mbtouc unistr/u8-mbtouc-unsafe 
unistr/u8-mbtoucr unistr/u8-prev unistr/u8-uctomb unitypes])
 gl_SOURCE_BASE([lib])
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 0ae96ead7..029347507 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -255,6 +255,8 @@ AC_DEFUN([gl_EARLY],
   # Code from module trunc:
   # Code from module tzset:
   # Code from module unistd:
+  # Code from module uniwidth/base:
+  # Code from module uniwidth/width:
   # Code from module unsetenv:
   # Code from module useless-if-before-free:
   # Code from module vasnprintf:
@@ -265,6 +267,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module wchar:
   # Code from module wcrtomb:
   # Code from module wctype-h:
+  # Code from module wcwidth:
   # Code from module write:
   # Code from module xalloc-oversized:
   # Code from module xsize:
@@ -795,10 +798,18 @@ AC_DEFUN([gl_INIT],
   gl_MATH_MODULE_INDICATOR([trunc])
   gl_UNISTD_H
   gl_UNISTD_H_REQUIRE_DEFAULTS
+  gl_LIBUNISTRING_LIBHEADER([0.9.11], [uniwidth.h])
+  gl_LIBUNISTRING_MODULE([0.9.8], [uniwidth/width])
   gl_FUNC_VSNPRINTF
   gl_STDIO_MODULE_INDICATOR([vsnprintf])
   gl_WCHAR_H
   gl_WCHAR_H_REQUIRE_DEFAULTS
+  gl_FUNC_WCWIDTH
+  if test $HAVE_WCWIDTH = 0 || test $REPLACE_WCWIDTH = 1; then
+    AC_LIBOBJ([wcwidth])
+    gl_PREREQ_WCWIDTH
+  fi
+  gl_WCHAR_MODULE_INDICATOR([wcwidth])
   gl_FUNC_WRITE
   if test $REPLACE_WRITE = 1; then
     AC_LIBOBJ([write])
@@ -849,7 +860,6 @@ AC_DEFUN([gl_INIT],
   gl_gnulib_enabled_sockets=false
   gl_gnulib_enabled_stat=false
   gl_gnulib_enabled_f9850631dca91859e9cddac9359921c0=false
-  gl_gnulib_enabled_streq=false
   gl_gnulib_enabled_sys_random=false
   gl_gnulib_enabled_tempname=false
   gl_gnulib_enabled_time_r=false
@@ -1098,9 +1108,6 @@ AC_SUBST([LTALLOCA])
       if { test $HAVE_MBRTOWC = 0 || test $REPLACE_MBRTOWC = 1; } && test 
$REPLACE_MBSTATE_T = 0; then
         func_gl_gnulib_m4code_mbsinit
       fi
-      if test $HAVE_MBRTOWC = 0 || test $REPLACE_MBRTOWC = 1; then
-        func_gl_gnulib_m4code_streq
-      fi
     fi
   }
   func_gl_gnulib_m4code_mbsinit ()
@@ -1356,12 +1363,6 @@ AC_SUBST([LTALLOCA])
       gl_gnulib_enabled_f9850631dca91859e9cddac9359921c0=true
     fi
   }
-  func_gl_gnulib_m4code_streq ()
-  {
-    if ! $gl_gnulib_enabled_streq; then
-      gl_gnulib_enabled_streq=true
-    fi
-  }
   func_gl_gnulib_m4code_sys_random ()
   {
     if ! $gl_gnulib_enabled_sys_random; then
@@ -1643,6 +1644,9 @@ AC_SUBST([LTALLOCA])
   if test $ac_cv_func_vsnprintf = no || test $REPLACE_VSNPRINTF = 1; then
     func_gl_gnulib_m4code_vasnprintf
   fi
+  if test $HAVE_WCWIDTH = 0 || test $REPLACE_WCWIDTH = 1; then
+    func_gl_gnulib_m4code_3dcce957eadc896e63ab5f137947b410
+  fi
   if test $REPLACE_WRITE = 1; then
     func_gl_gnulib_m4code_raise
   fi
@@ -1691,7 +1695,6 @@ AC_SUBST([LTALLOCA])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_sockets], [$gl_gnulib_enabled_sockets])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_stat], [$gl_gnulib_enabled_stat])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_f9850631dca91859e9cddac9359921c0], 
[$gl_gnulib_enabled_f9850631dca91859e9cddac9359921c0])
-  AM_CONDITIONAL([gl_GNULIB_ENABLED_streq], [$gl_gnulib_enabled_streq])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_sys_random], 
[$gl_gnulib_enabled_sys_random])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_tempname], [$gl_gnulib_enabled_tempname])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_time_r], [$gl_gnulib_enabled_time_r])
@@ -2106,6 +2109,9 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/tzset.c
   lib/unistd.c
   lib/unistd.in.h
+  lib/uniwidth.in.h
+  lib/uniwidth/cjk.h
+  lib/uniwidth/width.c
   lib/unsetenv.c
   lib/vasnprintf.c
   lib/vasnprintf.h
@@ -2117,6 +2123,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/wcrtomb.c
   lib/wctype-h.c
   lib/wctype.in.h
+  lib/wcwidth.c
   lib/windows-initguard.h
   lib/write.c
   lib/xalloc-oversized.h
@@ -2195,6 +2202,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/lib-ld.m4
   m4/lib-link.m4
   m4/lib-prefix.m4
+  m4/libunistring-base.m4
   m4/libunistring.m4
   m4/limits-h.m4
   m4/link.m4
@@ -2309,6 +2317,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/wchar_t.m4
   m4/wcrtomb.m4
   m4/wctype_h.m4
+  m4/wcwidth.m4
   m4/wint_t.m4
   m4/write.m4
   m4/xsize.m4
diff --git a/m4/libunistring-base.m4 b/m4/libunistring-base.m4
new file mode 100644
index 000000000..657bc0ded
--- /dev/null
+++ b/m4/libunistring-base.m4
@@ -0,0 +1,141 @@
+# libunistring-base.m4 serial 5
+dnl Copyright (C) 2010-2021 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Paolo Bonzini and Bruno Haible.
+
+dnl gl_LIBUNISTRING_MODULE([VERSION], [Module])
+dnl Declares that the source files of Module should be compiled, unless we
+dnl are linking with libunistring and its version is >= the given VERSION.
+dnl Defines an automake conditional LIBUNISTRING_COMPILE_$MODULE that is
+dnl true if the source files of Module should be compiled.
+dnl This macro is to be used for public libunistring API, not for
+dnl undocumented API.
+dnl
+dnl You have to bump the VERSION argument to the next projected version
+dnl number each time you make a change that affects the behaviour of the
+dnl functions defined in Module (even if the sources of Module itself do not
+dnl change).
+
+AC_DEFUN([gl_LIBUNISTRING_MODULE],
+[
+  AC_REQUIRE([gl_LIBUNISTRING_LIB_PREPARE])
+  dnl Use the variables HAVE_LIBUNISTRING, LIBUNISTRING_VERSION from
+  dnl gl_LIBUNISTRING_CORE if that macro has been run.
+  AM_CONDITIONAL(AS_TR_CPP([LIBUNISTRING_COMPILE_$2]),
+    [gl_LIBUNISTRING_VERSION_CMP([$1])])
+])
+
+dnl gl_LIBUNISTRING_LIBHEADER([VERSION], [HeaderFile])
+dnl Declares that HeaderFile should be created, unless we are linking
+dnl with libunistring and its version is >= the given VERSION.
+dnl HeaderFile should be relative to the lib directory and end in '.h'.
+dnl Prepares for substituting LIBUNISTRING_HEADERFILE (to HeaderFile or empty).
+dnl
+dnl When we are linking with the already installed libunistring and its version
+dnl is < VERSION, we create HeaderFile here, because we may compile functions
+dnl (via gl_LIBUNISTRING_MODULE above) that are not contained in the installed
+dnl version.
+dnl When we are linking with the already installed libunistring and its version
+dnl is > VERSION, we don't create HeaderFile here: it could cause compilation
+dnl errors in other libunistring header files if some types are missing.
+dnl
+dnl You have to bump the VERSION argument to the next projected version
+dnl number each time you make a non-comment change to the HeaderFile.
+
+AC_DEFUN([gl_LIBUNISTRING_LIBHEADER],
+[
+  AC_REQUIRE([gl_LIBUNISTRING_LIB_PREPARE])
+  dnl Use the variables HAVE_LIBUNISTRING, LIBUNISTRING_VERSION from
+  dnl gl_LIBUNISTRING_CORE if that macro has been run.
+  if gl_LIBUNISTRING_VERSION_CMP([$1]); then
+    LIBUNISTRING_[]AS_TR_CPP([$2])='$2'
+  else
+    LIBUNISTRING_[]AS_TR_CPP([$2])=
+  fi
+  AC_SUBST([LIBUNISTRING_]AS_TR_CPP([$2]))
+])
+
+dnl Miscellaneous preparations/initializations.
+
+AC_DEFUN([gl_LIBUNISTRING_LIB_PREPARE],
+[
+  dnl Ensure that HAVE_LIBUNISTRING is fully determined at this point.
+  m4_ifdef([gl_LIBUNISTRING], [AC_REQUIRE([gl_LIBUNISTRING])])
+
+  AC_REQUIRE([AC_PROG_AWK])
+
+dnl Sed expressions to extract the parts of a version number.
+changequote(,)
+gl_libunistring_sed_extract_major='/^[0-9]/{s/^\([0-9]*\).*/\1/p;q;}
+i\
+0
+q
+'
+gl_libunistring_sed_extract_minor='/^[0-9][0-9]*[.][0-9]/{s/^[0-9]*[.]\([0-9]*\).*/\1/p;q;}
+i\
+0
+q
+'
+gl_libunistring_sed_extract_subminor='/^[0-9][0-9]*[.][0-9][0-9]*[.][0-9]/{s/^[0-9]*[.][0-9]*[.]\([0-9]*\).*/\1/p;q;}
+i\
+0
+q
+'
+changequote([,])
+
+  if test "$HAVE_LIBUNISTRING" = yes; then
+    LIBUNISTRING_VERSION_MAJOR=`echo "$LIBUNISTRING_VERSION" | sed -n -e 
"$gl_libunistring_sed_extract_major"`
+    LIBUNISTRING_VERSION_MINOR=`echo "$LIBUNISTRING_VERSION" | sed -n -e 
"$gl_libunistring_sed_extract_minor"`
+    LIBUNISTRING_VERSION_SUBMINOR=`echo "$LIBUNISTRING_VERSION" | sed -n -e 
"$gl_libunistring_sed_extract_subminor"`
+  fi
+])
+
+dnl gl_LIBUNISTRING_VERSION_CMP([VERSION])
+dnl Expands to a shell statement that evaluates to true if LIBUNISTRING_VERSION
+dnl is less than the VERSION argument.
+AC_DEFUN([gl_LIBUNISTRING_VERSION_CMP],
+[ { test "$HAVE_LIBUNISTRING" != yes \
+    || {
+         dnl AS_LITERAL_IF exists and works fine since autoconf-2.59 at least.
+         AS_LITERAL_IF([$1],
+           [dnl This is the optimized variant, that assumes the argument is a 
literal:
+            m4_pushdef([requested_version_major],
+              [gl_LIBUNISTRING_ARG_OR_ZERO(m4_bpatsubst([$1], [^\([0-9]*\).*], 
[\1]), [])])
+            m4_pushdef([requested_version_minor],
+              [gl_LIBUNISTRING_ARG_OR_ZERO(m4_bpatsubst([$1], 
[^[0-9]*[.]\([0-9]*\).*], [\1]), [$1])])
+            m4_pushdef([requested_version_subminor],
+              [gl_LIBUNISTRING_ARG_OR_ZERO(m4_bpatsubst([$1], 
[^[0-9]*[.][0-9]*[.]\([0-9]*\).*], [\1]), [$1])])
+            test $LIBUNISTRING_VERSION_MAJOR -lt requested_version_major \
+            || { test $LIBUNISTRING_VERSION_MAJOR -eq requested_version_major \
+                 && { test $LIBUNISTRING_VERSION_MINOR -lt 
requested_version_minor \
+                      || { test $LIBUNISTRING_VERSION_MINOR -eq 
requested_version_minor \
+                           && test $LIBUNISTRING_VERSION_SUBMINOR -lt 
requested_version_subminor
+                         }
+                    }
+               }
+            m4_popdef([requested_version_subminor])
+            m4_popdef([requested_version_minor])
+            m4_popdef([requested_version_major])
+           ],
+           [dnl This is the unoptimized variant:
+            requested_version_major=`echo '$1' | sed -n -e 
"$gl_libunistring_sed_extract_major"`
+            requested_version_minor=`echo '$1' | sed -n -e 
"$gl_libunistring_sed_extract_minor"`
+            requested_version_subminor=`echo '$1' | sed -n -e 
"$gl_libunistring_sed_extract_subminor"`
+            test $LIBUNISTRING_VERSION_MAJOR -lt $requested_version_major \
+            || { test $LIBUNISTRING_VERSION_MAJOR -eq $requested_version_major 
\
+                 && { test $LIBUNISTRING_VERSION_MINOR -lt 
$requested_version_minor \
+                      || { test $LIBUNISTRING_VERSION_MINOR -eq 
$requested_version_minor \
+                           && test $LIBUNISTRING_VERSION_SUBMINOR -lt 
$requested_version_subminor
+                         }
+                    }
+               }
+           ])
+       }
+  }])
+
+dnl gl_LIBUNISTRING_ARG_OR_ZERO([ARG], [ORIG]) expands to ARG if it is not the
+dnl same as ORIG, otherwise to 0.
+m4_define([gl_LIBUNISTRING_ARG_OR_ZERO], [m4_if([$1], [$2], [0], [$1])])
diff --git a/m4/wcwidth.m4 b/m4/wcwidth.m4
new file mode 100644
index 000000000..2ac2a5148
--- /dev/null
+++ b/m4/wcwidth.m4
@@ -0,0 +1,115 @@
+# wcwidth.m4 serial 34
+dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_WCWIDTH],
+[
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+
+  dnl Persuade glibc <wchar.h> to declare wcwidth().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([gt_TYPE_WCHAR_T])
+  AC_REQUIRE([gt_TYPE_WINT_T])
+
+  AC_CHECK_HEADERS_ONCE([wchar.h])
+  AC_CHECK_FUNCS_ONCE([wcwidth])
+
+  AC_CHECK_DECLS([wcwidth], [], [], [[
+    #include <wchar.h>
+  ]])
+  if test $ac_cv_have_decl_wcwidth != yes; then
+    HAVE_DECL_WCWIDTH=0
+  fi
+
+  if test $ac_cv_func_wcwidth != yes; then
+    AC_CACHE_CHECK([whether wcwidth is a macro],
+      [gl_cv_func_wcwidth_macro],
+      [AC_EGREP_CPP([wchar_header_defines_wcwidth], [
+#include <wchar.h>
+#ifdef wcwidth
+ wchar_header_defines_wcwidth
+#endif],
+         [gl_cv_func_wcwidth_macro=yes],
+         [gl_cv_func_wcwidth_macro=no])
+      ])
+  fi
+
+  if test $ac_cv_func_wcwidth = yes || test $gl_cv_func_wcwidth_macro = yes; 
then
+    HAVE_WCWIDTH=1
+    dnl On Mac OS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.
+    dnl On NetBSD 9.0, OpenBSD 5.0, MidnightBSD 1.1,
+    dnl wcwidth(0x05B0) (HEBREW POINT SHEVA) returns 1.
+    dnl On NetBSD 9.0, MidnightBSD 1.1, OSF/1 5.1,
+    dnl wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.
+    dnl On OpenBSD 5.8, wcwidth(0xFF1A) (FULLWIDTH COLON) returns 0.
+    dnl This leads to bugs in 'ls' (coreutils).
+    dnl On Solaris 11.4, wcwidth(0x2202) (PARTIAL DIFFERENTIAL) returns 2,
+    dnl even in Western locales.
+    AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales],
+      [gl_cv_func_wcwidth_works],
+      [
+        AC_RUN_IFELSE(
+          [AC_LANG_SOURCE([[
+#include <locale.h>
+#include <wchar.h>
+#if !HAVE_DECL_WCWIDTH
+extern
+# ifdef __cplusplus
+"C"
+# endif
+int wcwidth (int);
+#endif
+int main ()
+{
+  int result = 0;
+  if (setlocale (LC_ALL, "en_US.UTF-8") != NULL)
+    {
+      if (wcwidth (0x0301) > 0)
+        result |= 1;
+      if (wcwidth (0x05B0) > 0)
+        result |= 2;
+      if (wcwidth (0x200B) > 0)
+        result |= 4;
+      if (wcwidth (0xFF1A) == 0)
+        result |= 8;
+      if (wcwidth (0x2202) > 1)
+        result |= 16;
+    }
+  return result;
+}]])],
+          [gl_cv_func_wcwidth_works=yes],
+          [gl_cv_func_wcwidth_works=no],
+          [
+changequote(,)dnl
+           case "$host_os" in
+                            # Guess yes on glibc systems.
+             *-gnu* | gnu*) gl_cv_func_wcwidth_works="guessing yes";;
+                            # Guess yes on musl systems.
+             *-musl*)       gl_cv_func_wcwidth_works="guessing yes";;
+                            # Guess yes on AIX 7 systems.
+             aix[7-9]*)     gl_cv_func_wcwidth_works="guessing yes";;
+             *)             gl_cv_func_wcwidth_works="$gl_cross_guess_normal";;
+           esac
+changequote([,])dnl
+          ])
+      ])
+    case "$gl_cv_func_wcwidth_works" in
+      *yes) ;;
+      *no) REPLACE_WCWIDTH=1 ;;
+    esac
+  else
+    HAVE_WCWIDTH=0
+  fi
+  dnl We don't substitute HAVE_WCWIDTH. We assume that if the system does not
+  dnl have the wcwidth function, then it does not declare it.
+])
+
+# Prerequisites of lib/wcwidth.c.
+AC_DEFUN([gl_PREREQ_WCWIDTH], [
+  AC_REQUIRE([AC_C_INLINE])
+  :
+])
-- 
2.32.0

>From 8026e94f6cf35c75a0a4f928c580b077f546a452 Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Tue, 3 Aug 2021 23:53:41 +0200
Subject: [PATCH 3/4] Export the wcwidth function

The wcwidth function computes the number of columns that a character
spans. It is in gnulib, but not documented. It is part of POSIX, and its
own module in Gnulib [1].

[1]: https://www.gnu.org/software/gnulib/manual/html_node/wcwidth.html
---
 doc/ref/api-data.texi |  7 +++++++
 libguile/chars.c      | 12 ++++++++++++
 libguile/chars.h      |  1 +
 3 files changed, 20 insertions(+)

diff --git a/doc/ref/api-data.texi b/doc/ref/api-data.texi
index 2ad13f5a5..a6647c3bf 100644
--- a/doc/ref/api-data.texi
+++ b/doc/ref/api-data.texi
@@ -2275,6 +2275,13 @@ with their meanings.
 @end multitable
 @end deffn
 
+@deffn {Scheme Procedure} wcwidth chr
+@deffnx {C Function} scm_wcwidth (chr)
+Return the number of columns that @var{chr} spans. This function depends
+on the @code{LC_CTYPE} locale category. Return @code{-1} if @var{chr} is
+not recognized.
+@end deffn
+
 @rnindex char->integer
 @deffn {Scheme Procedure} char->integer chr
 @deffnx {C Function} scm_char_to_integer (chr)
diff --git a/libguile/chars.c b/libguile/chars.c
index fe55f9e2e..7b31e0601 100644
--- a/libguile/chars.c
+++ b/libguile/chars.c
@@ -504,6 +504,18 @@ SCM_DEFINE (scm_char_general_category, 
"char-general-category", 1, 0, 0,
 }
 #undef FUNC_NAME
 
+SCM_DEFINE (scm_wcwidth, "wcwidth", 1, 0, 0,
+           (SCM chr),
+            "Return the number of columns that @var{chr} spans.")
+#define FUNC_NAME s_scm_wcwidth
+{
+  int width;
+  SCM_VALIDATE_CHAR (1, chr);
+  width = wcwidth (SCM_CHAR(chr));
+  return scm_from_int (width);
+}
+#undef FUNC_NAME
+
 
 
 
diff --git a/libguile/chars.h b/libguile/chars.h
index f6d4c6354..1bf7c2aa2 100644
--- a/libguile/chars.h
+++ b/libguile/chars.h
@@ -86,6 +86,7 @@ SCM_API SCM scm_char_upcase (SCM chr);
 SCM_API SCM scm_char_downcase (SCM chr);
 SCM_API SCM scm_char_titlecase (SCM chr);
 SCM_API SCM scm_char_general_category (SCM chr);
+SCM_API SCM scm_wcwidth (SCM chr);
 
 SCM_INLINE SCM scm_c_make_char (scm_t_wchar c);
 SCM_API scm_t_wchar scm_c_upcase (scm_t_wchar c);
-- 
2.32.0

>From 050817a7af5c9b402e13886b443554a446b2836c Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Tue, 3 Aug 2021 23:50:37 +0200
Subject: [PATCH 4/4] Use wcwidth to compute the textual port column

The wcwidth function computes the number of columns that a character
should span. By using it in the textual port column computation, we
increase the precision of error reporting [1].

[1] https://www.gnu.org/prep/standards/html_node/Errors.html#Errors
---
 doc/ref/api-io.texi                |  3 +-
 libguile/ports.c                   | 22 ++++----
 module/ice-9/suspendable-ports.scm | 38 ++++++--------
 test-suite/tests/ports.test        | 81 ++++++++++++++++++++++++------
 4 files changed, 97 insertions(+), 47 deletions(-)

diff --git a/doc/ref/api-io.texi b/doc/ref/api-io.texi
index 87d4af496..b5c95eef1 100644
--- a/doc/ref/api-io.texi
+++ b/doc/ref/api-io.texi
@@ -503,7 +503,8 @@ The @code{put-string} procedure returns an unspecified 
value.
 
 Textual ports have a textual position associated with them: a line and a
 column.  Reading in characters or writing them out advances the line and
-the column appropriately.
+the column appropriately. The textual position of a port increases
+monotonically, and ASCII characters increase the position strictly.
 
 @deffn {Scheme Procedure} port-column port
 @deffnx {Scheme Procedure} port-line port
diff --git a/libguile/ports.c b/libguile/ports.c
index c25c20709..0582f7d3a 100644
--- a/libguile/ports.c
+++ b/libguile/ports.c
@@ -38,6 +38,7 @@
 #include <uniconv.h>
 #include <unistd.h>
 #include <unistr.h>
+#include <wchar.h>
 
 #ifdef HAVE_IO_H
 #include <io.h>
@@ -1704,13 +1705,8 @@ update_port_position (SCM position, scm_t_wchar c)
 
   switch (c)
     {
-    case '\a':
     case EOF:
       break;
-    case '\b':
-      if (column > 0)
-        scm_port_position_set_column (position, scm_from_int (column - 1));
-      break;
     case '\n':
       {
         long line = scm_to_long (scm_port_position_line (position));
@@ -1718,15 +1714,23 @@ update_port_position (SCM position, scm_t_wchar c)
         scm_port_position_set_column (position, SCM_INUM0);
       }
       break;
-    case '\r':
-      scm_port_position_set_column (position, SCM_INUM0);
-      break;
     case '\t':
       scm_port_position_set_column (position,
                                     scm_from_int (column + 8 - column % 8));
       break;
     default:
-      scm_port_position_set_column (position, scm_from_int (column + 1));
+      {
+        int width = 1;
+        if (c >= 128)
+          {
+            width = wcwidth (c);
+            if (width == -1)
+              {
+                width = 1;
+              }
+          }
+        scm_port_position_set_column (position, scm_from_int (column + width));
+      }
       break;
     }
 }
diff --git a/module/ice-9/suspendable-ports.scm 
b/module/ice-9/suspendable-ports.scm
index a823f1d37..e964d65ae 100644
--- a/module/ice-9/suspendable-ports.scm
+++ b/module/ice-9/suspendable-ports.scm
@@ -559,29 +559,21 @@
               (lambda (buf bv cur buffered) (slow-path))))
 
 (define-inlinable (advance-port-position! pos char)
-  ;; FIXME: this cond is a speed hack; really we should just compile
-  ;; `case' better.
-  (cond
-   ;; FIXME: char>? et al should compile well.
-   ((<= (char->integer #\space) (char->integer char))
-    (set-port-position-column! pos (1+ (port-position-column pos))))
-   (else
-    (case char
-      ((#\alarm) #t)                    ; No change.
-      ((#\backspace)
-       (let ((col (port-position-column pos)))
-         (when (> col 0)
-           (set-port-position-column! pos (1- col)))))
-      ((#\newline)
-       (set-port-position-line! pos (1+ (port-position-line pos)))
-       (set-port-position-column! pos 0))
-      ((#\return)
-       (set-port-position-column! pos 0))
-      ((#\tab)
-       (let ((col (port-position-column pos)))
-         (set-port-position-column! pos (- (+ col 8) (remainder col 8)))))
-      (else
-       (set-port-position-column! pos (1+ (port-position-column pos))))))))
+  (if (>= (char->integer char) 128)
+      (let ((width (wcwidth char)))
+        (set-port-position-column!
+         pos
+         (+ (port-position-column pos)
+            (if (= width -1) 1 width))))
+      (case char
+        ((#\newline)
+         (set-port-position-line! pos (1+ (port-position-line pos)))
+         (set-port-position-column! pos 0))
+        ((#\tab)
+         (let ((col (port-position-column pos)))
+           (set-port-position-column! pos (- (+ col 8) (remainder col 8)))))
+        (else
+         (set-port-position-column! pos (1+ (port-position-column pos)))))))
 
 (define* (read-char #:optional (port (current-input-port)))
   (define (finish buf char)
diff --git a/test-suite/tests/ports.test b/test-suite/tests/ports.test
index cd87640ab..5b968887e 100644
--- a/test-suite/tests/ports.test
+++ b/test-suite/tests/ports.test
@@ -1195,22 +1195,22 @@
     (pass-if "\\a"
       (let ((port (open-output-string)))
         (display "\a" port)
-        (= 0 (port-column port))))
+        (= 1 (port-column port))))
 
     (pass-if "x\\a"
       (let ((port (open-output-string)))
         (display "x\a" port)
-        (= 1 (port-column port))))
+        (= 2 (port-column port))))
 
     (pass-if "\\x08 backspace"
       (let ((port (open-output-string)))
         (display "\x08" port)
-        (= 0 (port-column port))))
+        (= 1 (port-column port))))
 
     (pass-if "x\\x08 backspace"
       (let ((port (open-output-string)))
         (display "x\x08" port)
-        (= 0 (port-column port))))
+        (= 2 (port-column port))))
 
     (pass-if "\\n"
       (let ((port (open-output-string)))
@@ -1225,12 +1225,12 @@
     (pass-if "\\r"
       (let ((port (open-output-string)))
         (display "\r" port)
-        (= 0 (port-column port))))
+        (= 1 (port-column port))))
 
     (pass-if "x\\r"
       (let ((port (open-output-string)))
         (display "x\r" port)
-        (= 0 (port-column port))))
+        (= 2 (port-column port))))
 
     (pass-if "\\t"
       (let ((port (open-output-string)))
@@ -1240,7 +1240,31 @@
     (pass-if "x\\t"
       (let ((port (open-output-string)))
         (display "x\t" port)
-        (= 8 (port-column port)))))
+        (= 8 (port-column port))))
+
+    (pass-if "漢字 in C locale"
+      (setlocale LC_CTYPE "C")
+      (let ((port (open-output-string)))
+        (display "漢字" port)
+        (= 2 (port-column port))))
+
+    (pass-if "x漢字 in C locale"
+      (setlocale LC_CTYPE "C")
+      (let ((port (open-output-string)))
+        (display "x漢字" port)
+        (= 3 (port-column port))))
+
+    (pass-if "漢字 in UTF-8 locale"
+      (setlocale LC_CTYPE "en_US.UTF-8")
+      (let ((port (open-output-string)))
+        (display "漢字" port)
+        (= 4 (port-column port))))
+
+    (pass-if "x漢字 in UTF-8 locale"
+      (setlocale LC_CTYPE "en_US.UTF-8")
+      (let ((port (open-output-string)))
+        (display "x漢字" port)
+        (= 5 (port-column port)))))
 
   (with-test-prefix "input"
 
@@ -1252,22 +1276,22 @@
     (pass-if "\\a"
       (let ((port (open-input-string "\a")))
         (while (not (eof-object? (read-char port))))
-        (= 0 (port-column port))))
+        (= 1 (port-column port))))
 
     (pass-if "x\\a"
       (let ((port (open-input-string "x\a")))
         (while (not (eof-object? (read-char port))))
-        (= 1 (port-column port))))
+        (= 2 (port-column port))))
 
     (pass-if "\\x08 backspace"
       (let ((port (open-input-string "\x08")))
         (while (not (eof-object? (read-char port))))
-        (= 0 (port-column port))))
+        (= 1 (port-column port))))
 
     (pass-if "x\\x08 backspace"
       (let ((port (open-input-string "x\x08")))
         (while (not (eof-object? (read-char port))))
-        (= 0 (port-column port))))
+        (= 2 (port-column port))))
 
     (pass-if "\\n"
       (let ((port (open-input-string "\n")))
@@ -1282,12 +1306,12 @@
     (pass-if "\\r"
       (let ((port (open-input-string "\r")))
         (while (not (eof-object? (read-char port))))
-        (= 0 (port-column port))))
+        (= 1 (port-column port))))
 
     (pass-if "x\\r"
       (let ((port (open-input-string "x\r")))
         (while (not (eof-object? (read-char port))))
-        (= 0 (port-column port))))
+        (= 2 (port-column port))))
 
     (pass-if "\\t"
       (let ((port (open-input-string "\t")))
@@ -1297,7 +1321,36 @@
     (pass-if "x\\t"
       (let ((port (open-input-string "x\t")))
         (while (not (eof-object? (read-char port))))
-        (= 8 (port-column port))))))
+        (= 8 (port-column port))))
+
+    (pass-if "漢字 in C locale"
+      (setlocale LC_CTYPE "C")
+      (let ((port (open-input-string "漢字")))
+        (while (not (eof-object? (read-char port))))
+        ;; There are 2 characters, but wcwidth failed so it
+        ;; returned 2.
+        (= 2 (port-column port))))
+
+    (pass-if "x漢字 in C locale"
+      (setlocale LC_CTYPE "C")
+      (let ((port (open-input-string "x漢字")))
+        (while (not (eof-object? (read-char port))))
+        (= 3 (port-column port))))
+
+    (pass-if "漢字 in UTF-8 locale"
+      (setlocale LC_CTYPE "en_US.UTF-8")
+      (let ((port (open-input-string "漢字")))
+        (while (not (eof-object? (read-char port))))
+        (setlocale LC_CTYPE "C")
+        ;; there are only 2 characters, but 4 columns
+        (= 4 (port-column port))))
+
+    (pass-if "x漢字 in UTF-8 locale"
+      (setlocale LC_CTYPE "en_US.UTF-8")
+      (let ((port (open-input-string "x漢字")))
+        (while (not (eof-object? (read-char port))))
+        (setlocale LC_CTYPE "C")
+        (= 5 (port-column port))))))
 
 (with-test-prefix "port-line"
 
-- 
2.32.0


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