/usr/share/aclocal/ax_check_symbol.m4 is in autoconf-archive 20110917-1.
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_check_symbol.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_SYMBOL(SYMBOL, HEADER... [,ACTION-IF-FOUND [,ACTION-IF-NOT-FOUND]])
#
# DESCRIPTION
#
# A wrapper around AC_EGREP_HEADER. The shellvar $ac_found will hold the
# HEADER-name that had been containing the symbol. This value is shown to
# the user.
#
# 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 5
AU_ALIAS([AC_CHECK_SYMBOL], [AX_CHECK_SYMBOL])
AC_DEFUN([AX_CHECK_SYMBOL],
[AC_MSG_CHECKING([for $1 in $2])
AC_CACHE_VAL(ac_cv_func_$1,
[AC_REQUIRE_CPP()dnl
changequote(, )dnl
symbol="[^a-zA-Z_0-9]$1[^a-zA-Z_0-9]"
changequote([, ])dnl
ac_found=no
for ac_header in $2 ; do
ac_safe=`echo "$ac_header" | sed 'y%./+-%__p_%' `
if test $ac_found != "yes" ; then
if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
AC_EGREP_HEADER( $symbol, $ac_header, [ac_found="$ac_header"] )
fi
fi
done
if test "$ac_found" != "no" ; then
AC_MSG_RESULT($ac_found)
ifelse([$3], , :, [$3])
else
AC_MSG_RESULT(no)
ifelse([$4], , , [$4
])dnl
fi
])])
dnl AX_CHECK_SYMBOLS( symbol..., header... [, action-if-found [, action-if-not-found]])
AC_DEFUN([AX_CHECK_SYMBOLS],
[for ac_func in $1
do
P4_CHECK_SYMBOL($ac_func, $2,
[changequote(, )dnl
ac_tr_func=HAVE_`echo $ac_func | sed -e 'y:abcdefghijklmnopqrstuvwxyz:ABCDEFGHIJKLMNOPQRSTUVWXYZ:' -e 's:[[^A-Z0-9]]:_:'`
changequote([, ])dnl
AC_DEFINE_UNQUOTED($ac_tr_func) $2], $3)dnl
done
])
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