automake: AM_CONDITIONAL failure with automake-1.7, was ok 1.6.3

[Juergen Keil]

Hi,

it seems there's a regression with automake-1.7.  The following
construct (see also the attached "cond26.test" test script intended for
automake's tests subdirectory) works OK with automake 1.6.3,  but fails
with the error message

    Makefile.am:1: `m4data_DATA' is used but `m4datadir' is undefined.

when using automake-1.7

-----------------------------------------------------------------
#!/bin/sh
cat >configure.in << 'EOF'
AC_INIT
AM_INIT_AUTOMAKE("foo", 1.0.0)

AC_SUBST(ACLOCAL_DIR)
AM_CONDITIONAL([INSTALL_M4], [test x"$ACLOCAL_DIR" != "x"])

AC_CONFIG_FILES([Makefile])
AC_OUTPUT
EOF

cat >Makefile.am << 'EOF'
m4data_DATA = foo.m4

if INSTALL_M4
m4datadir = @ACLOCAL_DIR@
else
m4datadir = $(datadir)/aclocal
endif

EXTRA_DIST = foo.m4
EOF

$ACLOCAL || exit 1
$AUTOMAKE || exit 1
-----------------------------------------------------------------

Platform: Solaris 8 x86
Perl: 5.0 patchlevel 5 subversion 3
gcc-3.2

cond26.test
Description: cond26.test