/usr/share/aclocal/ax_warning_default_aclocaldir.m4 is in autoconf-archive 20140228-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# http://www.gnu.org/software/autoconf-archive/ax_warning_default_aclocaldir.html
# =================================================================================
#
# SYNOPSIS
#
# AX_WARNING_DEFAULT_ACLOCALDIR [(dirvariable [,[defsetting][,[A][,[N/A]]]])]
# AX_ENABLE_DEFAULT_ACLOCALDIR [(dirvariable [,defsetting])]
#
# DESCRIPTION
#
# print a warning message if the $(datadir)/aclocal directory is not in
# the dirlist searched by the aclocal tool. This macro is useful if some
# `make install` would target $(datadir)/aclocal to install an autoconf m4
# file of your project to be picked up by other projects.
#
# default $1 dirvariable = aclocaldir
# default $2 defsetting = ${datadir}/aclocal
# default $3 action = nothing to do
# default $4 action = warn the user about mismatch
#
# In the _WARNING_ variant, the defsetting is not placed in dirvariable
# nor is it ac_subst'ed in any way. The default fail-action $4 is to send
# a warning message to the user, and the default accept-action $3 is
# nothing. It is expected that a Makefile is generated with
# aclocaldir=${datadir}/aclocal
#
# The _ENABLE_ variant however will set not only the $aclocaldir shell var
# of the script, but it is also AC-SUBST'ed on default - and furthermore a
# configure option "--enable-default-aclocaldir" is provided. Only if that
# option is set then $2 default is not set to the canonic default in the a
# $prefix subpath but instead $2 default is set to the primary path where
# `aclocal` looks for macros. The user may also override the default on
# the command line.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# 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 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 General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 8
AC_DEFUN([AX_WARNING_DEFAULT_ACLOCALDIR],[dnl
AC_REQUIRE([AX_EXPAND_PREFIX])dnl
AS_VAR_PUSHDEF([DIR],[ax_warning_default_aclocal_dir])dnl
AS_VAR_PUSHDEF([BIN],[ax_warning_default_aclocal_bin])dnl
AS_VAR_PUSHDEF([LOC],[ax_warning_default_aclocal_loc])dnl
LOC='m4_if([$2],,[${datadir}/aclocal],[$2])'
m4_ifval([$1],[test ".$[]$1" != "." && LOC="$[]$1"])
if test ".$ACLOCAL" = "." ; then
AC_PATH_PROG([ACLOCAL],[aclocal],[:])
fi
BIN="$ACLOCAL"
test ".$BIN" = "." && BIN="aclocal"
DIR=`test ".$SHELL" = "." && SHELL="'sh'" ; eval "$BIN --print-ac-dir"`
test ".$DIR" = "." && test -d "/usr/share/aclocal" && DIR="/usr/share/aclocal"
test ".$DIR" = "." && DIR="/tmp"
DIR=`eval "echo $DIR"` # we need to expand
DIR=`eval "echo $DIR"`
LOC=`eval "echo $LOC"`
LOC=`eval "echo $LOC"`
LOC=`eval "echo $LOC"`
LOC=`eval "echo $LOC"`
AC_RUN_LOG([: test "$LOC" = "$DIR"])
if test "$LOC" != "$DIR" ; then
if test -f "$DIR/dirlist" ; then
for DIR in `cat $DIR/dirlist` $DIR ; do
AC_RUN_LOG([: test "$LOC" = "$DIR"])
test "$LOC" = "$DIR" && break
done
fi
if test "$LOC" != "$DIR" ; then
m4_ifval([$4],[$4],[dnl
AC_MSG_NOTICE([warning: m4_if([$1],,[aclocaldir],[$1])=$LOC dnl
(see config.log)])
AC_MSG_NOTICE([perhaps: make install m4_if([$1],,[aclocaldir],[$1])=$DIR])
cat m4_ifset([AS_MESSAGE_LOG_FD],[>&AS_MESSAGE_LOG_FD],[>>config.log]) <<EOF
aclocaldir: the m4_if([$1],,[default aclocaldir],[$1 value]) of $LOC
aclocaldir: is not listed in the dirlist where aclocal will look
aclocaldir: for macros - you can override the install-path using
aclocaldir: make install aclocaldir=$DIR
aclocaldir: or append the directory to aclocal reconfigures later as
aclocaldir: aclocal -I $LOC
aclocaldir: when an autoconf macro is needed from that directory
EOF
m4_ifvaln([$5],[$5])])dnl
m4_ifvaln([$3],[else $3])dnl
fi
fi
AS_VAR_POPDEF([LOC])dnl
AS_VAR_POPDEF([BIN])dnl
AS_VAR_POPDEF([DIR])dnl
])
AC_DEFUN([AX_ENABLE_DEFAULT_ACLOCALDIR],[dnl
AS_VAR_PUSHDEF([BIN],[ax_warning_default_aclocal_bin])dnl
AS_VAR_PUSHDEF([DIR],[ax_warning_default_aclocal_def])dnl
AS_VAR_PUSHDEF([DEF],[ax_warning_default_aclocal_def])dnl
AC_ARG_ENABLE([default-aclocaldir],
[AS_HELP_STRING([--enable-default-aclocaldir@<:@=PATH@:>@], [override the datadir/aclocal default])])
test ".$enable_default_aclocaldir" = "." && enable_default_aclocaldir="no"
case ".$enable_default_aclocaldir" in
.no) DIR='m4_if([$2],,[${datadir}/aclocal],[$2])' ;;
.yes) # autodetect
if test ".$ACLOCAL" = "." ; then
AC_PATH_PROG([ACLOCAL],[aclocal],[:])
fi
BIN="$ACLOCAL"
test ".$BIN" = "." && BIN="aclocal"
DIR=`test ".$SHELL" = "." && SHELL="'sh'" ; eval "$BIN --print-ac-dir"`
test ".$DIR" = "." && test -d "/usr/share/aclocal" && DIR="/usr/share/aclocal"
test ".$DIR" = "." && DIR="/tmp" ;;
*) DIR="$enable_default_aclocaldir" ;;
esac
AX_WARNING_DEFAULT_ACLOCALDIR([$1],[$DEF],[$3],[$4],[$5])
m4_if([$1],,[aclocaldir],[$1])="$ax_warning_default_aclocal_dir"
AC_SUBST(m4_if([$1],,[aclocaldir],[$1]))
AS_VAR_POPDEF([DEF])dnl
AS_VAR_POPDEF([DIR])dnl
AS_VAR_POPDEF([BIN])dnl
])
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