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+# ===========================================================================
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+# http://www.gnu.org/software/autoconf-archive/ax_append_flag.html
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+# ===========================================================================
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+#
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+# SYNOPSIS
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+#
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+# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
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+#
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+# DESCRIPTION
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+#
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+# FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
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+# added in between.
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+#
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+# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
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+# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains
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+# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly
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+# FLAG.
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+#
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+# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
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+#
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+# LICENSE
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+#
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+# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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+# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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+#
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+# This program is free software: you can redistribute it and/or modify it
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+# under the terms of the GNU General Public License as published by the
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+# Free Software Foundation, either version 3 of the License, or (at your
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+# option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful, but
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+# WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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+# Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License along
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+# with this program. If not, see <http://www.gnu.org/licenses/>.
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+#
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+# As a special exception, the respective Autoconf Macro's copyright owner
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+# gives unlimited permission to copy, distribute and modify the configure
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+# scripts that are the output of Autoconf when processing the Macro. You
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+# need not follow the terms of the GNU General Public License when using
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+# or distributing such scripts, even though portions of the text of the
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+# Macro appear in them. The GNU General Public License (GPL) does govern
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+# all other use of the material that constitutes the Autoconf Macro.
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+#
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+# This special exception to the GPL applies to versions of the Autoconf
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+# Macro released by the Autoconf Archive. When you make and distribute a
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+# modified version of the Autoconf Macro, you may extend this special
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+# exception to the GPL to apply to your modified version as well.
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+
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+#serial 2
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+
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+AC_DEFUN([AX_APPEND_FLAG],
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+[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
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+AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])dnl
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+AS_VAR_SET_IF(FLAGS,
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+ [case " AS_VAR_GET(FLAGS) " in
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+ *" $1 "*)
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+ AC_RUN_LOG([: FLAGS already contains $1])
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+ ;;
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+ *)
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+ AC_RUN_LOG([: FLAGS="$FLAGS $1"])
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+ AS_VAR_SET(FLAGS, ["AS_VAR_GET(FLAGS) $1"])
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+ ;;
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+ esac],
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+ [AS_VAR_SET(FLAGS,["$1"])])
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+AS_VAR_POPDEF([FLAGS])dnl
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+])dnl AX_APPEND_FLAG
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