/usr/share/aclocal/ax_cxx_have_string_push_back.m4 is in autoconf-archive 20140228-1.1.
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# http://www.gnu.org/software/autoconf-archive/ax_cxx_have_string_push_back.html
# ================================================================================
#
# SYNOPSIS
#
# AX_CXX_HAVE_STRING_PUSH_BACK
#
# DESCRIPTION
#
# If the implementation of the C++ library provides the method
# std::string::push_back (char), define HAVE_STRING_PUSH_BACK.
#
# LICENSE
#
# Copyright (c) 2008 Jan Langer <jan@langernetz.de>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 6
AU_ALIAS([AC_CXX_HAVE_STRING_PUSH_BACK], [AX_CXX_HAVE_STRING_PUSH_BACK])
AC_DEFUN([AX_CXX_HAVE_STRING_PUSH_BACK],
[AC_CACHE_CHECK(whether the compiler has std::string::push_back (char),
ax_cv_cxx_have_string_push_back,
[AC_REQUIRE([AX_CXX_NAMESPACES])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <string>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[string message; message.push_back ('a'); return 0;],
ax_cv_cxx_have_string_push_back=yes, ax_cv_cxx_have_string_push_back=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_have_string_push_back" = yes; then
AC_DEFINE(HAVE_STRING_PUSH_BACK,,[define if the compiler has the method
std::string::push_back (char)])
fi
])dnl
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