>From 2c5e2dc1882bd48241713149daecc73081c60cce Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sat, 30 Dec 2023 15:42:37 +0100
Subject: [PATCH] Fix "make check" failures on Alpine Linux, where gzip is from
 BusyBox.

* lib/am/distdir.am (GZIP_ENV): Set to -9, not --best.
(distcheck): Don't use GZIP_ENV when invoking gzip for decompression.
* doc/automake.texi (The Types of Distributions): Document the change.
---
 doc/automake.texi | 2 +-
 lib/am/distdir.am | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/doc/automake.texi b/doc/automake.texi
index 4de175bd7..f2824b511 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -9242,7 +9242,7 @@ distributions in various formats.  Their targets are:
 @vindex GZIP_ENV
 Generate a @samp{gzip} tar archive of the distribution.  This is the
 only format enabled by default.  By default, this rule makes
-@command{gzip} use a compression option of @option{--best}.  To make
+@command{gzip} use a compression option of @option{-9}.  To make
 it use a different one, set the @env{GZIP_ENV} environment variable.
 For example, @samp{make dist-gzip GZIP_ENV=-7}.
 
diff --git a/lib/am/distdir.am b/lib/am/distdir.am
index 0dd3a2e3f..7206bbb84 100644
--- a/lib/am/distdir.am
+++ b/lib/am/distdir.am
@@ -331,7 +331,7 @@ endif %?TOPDIR_P%
 if %?TOPDIR_P%
 
 ?GZIP?DIST_ARCHIVES += $(distdir).tar.gz
-GZIP_ENV = --best
+GZIP_ENV = -9
 .PHONY: dist-gzip
 dist-gzip: distdir
 	tardir=$(distdir) && $(am__tar) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).tar.gz
@@ -440,7 +440,7 @@ AM_DISTCHECK_DVI_TARGET = dvi
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
+	  eval GZIP= gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
 	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lz*) \
@@ -450,7 +450,7 @@ distcheck: dist
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
+	  eval GZIP= gzip -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
 	*.tar.zst*) \
-- 
2.34.1