/usr/share/aclocal/ax_string_strcasecmp.m4 is in autoconf-archive 20131101-1.
This file is owned by root:root, with mode 0o644.
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# http://www.gnu.org/software/autoconf-archive/ax_string_strcasecmp.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_STRING_STRCASECMP
#
# DESCRIPTION
#
# This macro tries to find strcasecmp() in string.h.
#
# Use this macro in conjunction with AX_STRINGS_STRCASECMP in your
# configure.in like so:
#
# AX_STRING_STRCASECMP
# if test x"$ac_cv_string_strcasecmp" = "xno" ; then
# AX_STRINGS_STRCASECMP
# fi
#
# This will cause either HAVE_STRING_STRCASECMP or HAVE_STRINGS_STRCASECMP
# to be defined in config.h, which will tell your code what header to
# include to get strcasecmp()'s prototype.
#
# LICENSE
#
# Copyright (c) 2008 Warren Young <warren@etr-usa.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 7
AU_ALIAS([ETR_STRING_STRCASECMP], [AX_STRING_STRCASECMP])
AC_DEFUN([AX_STRING_STRCASECMP],
[
AC_CACHE_CHECK([for strcasecmp() in string.h], ac_cv_string_strcasecmp, [
AC_TRY_LINK(
[ #include <string.h> ],
[ strcasecmp("foo", "bar"); ],
ac_cv_string_strcasecmp=yes,
ac_cv_string_strcasecmp=no)
])
if test x"$ac_cv_string_strcasecmp" = "xyes"
then
AC_DEFINE(HAVE_STRING_STRCASECMP, 1,
[ Define if your system has strcasecmp() in string.h ])
fi
]) dnl AX_STRING_STRCASECMP
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