/usr/share/aclocal/ax_save_flags.m4 is in autoconf-archive 20110917-1.
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# http://www.gnu.org/software/autoconf-archive/ax_save_flags.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_SAVE_FLAGS()
#
# DESCRIPTION
#
# Save common compilation flags into temporary variables
#
# LICENSE
#
# Copyright (c) 2009 Filippo Giunchedi <filippo@esaurito.net>
#
# 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 3
AC_DEFUN([AX_SAVE_FLAGS], [
CPPFLAGS_save="${CPPFLAGS}"
CFLAGS_save="${CFLAGS}"
CXXFLAGS_save="${CXXFLAGS}"
OBJCFLAGS_save="${OBJCFLAGS}"
LDFLAGS_save="${LDFLAGS}"
LIBS_save="${LIBS}"
])
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