/usr/share/aclocal/ax_cxx_member_templates.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_member_templates.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_MEMBER_TEMPLATES
#
# DESCRIPTION
#
# If the compiler supports member templates, define HAVE_MEMBER_TEMPLATES.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# 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_MEMBER_TEMPLATES], [AX_CXX_MEMBER_TEMPLATES])
AC_DEFUN([AX_CXX_MEMBER_TEMPLATES],
[AC_CACHE_CHECK(whether the compiler supports member templates,
ax_cv_cxx_member_templates,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([
template<class T, int N> class A
{ public:
template<int N2> A<T,N> operator=(const A<T,N2>& z) { return A<T,N>(); }
};],[A<double,4> x; A<double,7> y; x = y; return 0;],
ax_cv_cxx_member_templates=yes, ax_cv_cxx_member_templates=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_member_templates" = yes; then
AC_DEFINE(HAVE_MEMBER_TEMPLATES,,[define if the compiler supports member templates])
fi
])
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