/usr/share/aclocal/ax_subdir_files.m4 is in autoconf-archive 20150925-1.
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_subdir_files.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_SUBDIR_FILES [(SUBDIRS [, CASEPATTERN])]
#
# DESCRIPTION
#
# Look into subdirs and copy the (real) files that match pattern into the
# local directory. Preferably we use a symbolic link of course. existing
# local files are not overwritten.
#
# The default casepattern is "*.?|*.cc|*.cpp", the default subdir-list
# contains all subdirs available.
#
# 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 6
AU_ALIAS([AC_SUBDIR_FILES], [AX_SUBDIR_FILES])
AC_DEFUN([AX_SUBDIR_FILES],
[AC_BEFORE($0,[AX_PROG_CP_S])
for ac_subdir in ifelse([$1], , *, $1) ; do
if test -d $ac_subdir ; then
AC_MSG_CHECKING(subdir $ac_subdir)
for ac_file in $ac_subdir/* ; do
if test -f $ac_file ; then
if test ! -e `basename $ac_file` ; then
case `basename $ac_file` in
ifelse([$2], , *.?|*.cc|*.cpp,[$1]))
echo ${ECHO_N} "$ac_file," ;
$CP_S $ac_file . ;;
esac
fi
fi
done
AC_MSG_RESULT(;)
fi
done
])
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