/usr/share/aclocal/ax_cxx_have_ext_hash_map.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_cxx_have_ext_hash_map.html
# ============================================================================
#
# SYNOPSIS
#
# AX_CXX_HAVE_EXT_HASH_MAP
#
# DESCRIPTION
#
# Check if the compiler has ext/hash_map Eg:
#
# #if defined(HAVE_EXT_HASH_MAP)
# #include <ext/hash_map>
# #else
# #if defined(HAVE_STL)
# #include <hash_map>
# #else
# # Can't find hash_map header !
# #endif
# #endif
#
# This file is Alain BARBET's AC_CXX_HAVE_EXT_HASH_SET 1.1 with
# s/set/map/g :)
#
# LICENSE
#
# Copyright (c) 2008 Perceval ANICHINI
#
# 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 5
AU_ALIAS([AC_CXX_HAVE_EXT_HASH_MAP], [AX_CXX_HAVE_EXT_HASH_MAP])
AC_DEFUN([AX_CXX_HAVE_EXT_HASH_MAP],
[AC_CACHE_CHECK(whether the compiler has ext/hash_map,
ax_cv_cxx_have_ext_hash_map,
[AC_REQUIRE([AX_CXX_NAMESPACES])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <ext/hash_map>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[hash_map<int, int> t; return 0;],
ax_cv_cxx_have_ext_hash_map=yes, ax_cv_cxx_have_ext_hash_map=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_have_ext_hash_map" = yes; then
AC_DEFINE(HAVE_EXT_HASH_MAP,,[define if the compiler has ext/hash_map])
fi
])
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