/usr/share/aclocal/ax_gcc_version.m4 is in autoconf-archive 20160916-1.
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_gcc_version.html
# ===========================================================================
#
# OBSOLETE MACRO
#
# Use AX_COMPILER_VERSION instead
#
# SYNOPSIS
#
# AX_GCC_VERSION
#
# DESCRIPTION
#
# This macro retrieves the gcc version and returns it in the GCC_VERSION
# variable if available, an empty string otherwise.
#
# LICENSE
#
# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
#
# 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 2 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 10
AC_DEFUN([AX_GCC_VERSION], [
AC_OBSOLETE([$0], [;please use AX_COMPILER_VERSION instead])
AC_LANG_PUSH([C])
AC_REQUIRE([AX_COMPILER_VENDOR])
AC_REQUIRE([AX_COMPILER_VERSION])
AC_LANG_POP([C])
GCC_VERSION=""
ax_cv_gcc_version=""
AS_IF([test "X$ax_cv_c_compiler_vendor" = "Xgnu"],
[dnl
ax_cv_gcc_version=$ax_cv_c_compiler_version
GCC_VERSION=$ax_cv_gcc_version
])
AC_SUBST([GCC_VERSION])
])
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