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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_config_feature.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CONFIG_FEATURE(FEATURE-NAME, FEATURE-DESCRIPTION, DEFINE, DEFINE-DESCRIPTION, [ACTION-IF-ENABLED [, ACTION-IF-NOT-ENABLED]])
+#
+# DESCRIPTION
+#
+# AX_CONFIG_FEATURE is a simple wrapper for AC_ARG_ENABLE, it enables the
+# feature FEATURE-NAME and AC_DEFINEs the passed DEFINE, depending on the
+# user choice. DESCRIPTION will be used for AC_DEFINEs. ACTION-IF-ENABLED
+# and ACTION-IF-NOT-ENABLED are the actions that will be run. A feature is
+# enabled by default, in order to change this behaviour use the
+# AX_CONFIG_FEATURE_DEFAULT_ENABLED and AX_CONFIG_FEATURE_DEFAULT_DISABLED
+# macros.
+#
+# A simple example:
+#
+# AX_CONFIG_FEATURE_DEFAULT_ENABLED
+# AX_CONFIG_FEATURE(feature_xxxxx, [turns on/off XXXXX support],
+# HAVE_XXXXX, [Define if you want XXXXX support])
+#
+# ...
+#
+# AX_CONFIG_FEATURE_DEFAULT_DISABLED
+# AX_CONFIG_FEATURE(feature_yyyyy, [turns on/off YYYYY support],
+# HAVE_YYYYY, [Define if you want YYYYY support],
+# [enable_yyyyy="yes"], [enable_yyyyy="no"])
+# AM_CONDITIONAL(YYYYY, [test "$enable_yyyyy" = "yes"])
+#
+# AX_CONFIG_FEATURE_DEFAULT_ENABLED
+# AX_CONFIG_FEATURE(...)
+#
+# ...
+#
+# If you have lot of features and you want a verbose dumping of each user
+# selection use AX_CONFIG_FEATURE_VERBOSE. Use AX_CONFIG_FEATURE_SILENT in
+# order to remove a previously AX_CONFIG_FEATURE_VERBOSE. By default
+# features are silent.
+#
+# Use AX_CONFIG_FEATURE_ENABLE or AX_CONFIG_FEATURE_DISABLE in order to
+# enable or disable a specific feature.
+#
+# Another simple example:
+#
+# AS_IF([some_test_here],[AX_CONFIG_FEATURE_ENABLE(feature_xxxxx)],[])
+#
+# AX_CONFIG_FEATURE(feature_xxxxx, [turns on/off XXXXX support],
+# HAVE_XXXXX, [Define if you want XXXXX support])
+# AX_CONFIG_FEATURE(feature_yyyyy, [turns on/off YYYYY support],
+# HAVE_YYYYY, [Define if you want YYYYY support],
+# [enable_yyyyy="yes"], [enable_yyyyy="no"])
+#
+# ...
+#
+# NOTE: AX_CONFIG_FEATURE_ENABLE() must be placed first of the relative
+# AX_CONFIG_FEATURE() macro ...
+#
+# LICENSE
+#
+# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 10
+
+AC_DEFUN([AX_CONFIG_FEATURE],[ dnl
+m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
+
+AC_ARG_ENABLE([$1],AS_HELP_STRING([--enable-$1],[$2]),[
+case "${enableval}" in
+ yes)
+ ax_config_feature_[]FEATURE[]="yes"
+ ;;
+ no)
+ ax_config_feature_[]FEATURE[]="no"
+ ;;
+ *)
+ AC_MSG_ERROR([bad value ${enableval} for feature --$1])
+ ;;
+esac
+])
+
+AS_IF([test "$ax_config_feature_[]FEATURE[]" = yes],[ dnl
+ AC_DEFINE([$3])
+ $5
+ AS_IF([test "$ax_config_feature_verbose" = yes],[ dnl
+ AC_MSG_NOTICE([Feature $1 is enabled])
+ ])
+],[ dnl
+ $6
+ AS_IF([test "$ax_config_feature_verbose" = yes],[ dnl
+ AC_MSG_NOTICE([Feature $1 is disabled])
+ ])
+])
+
+AH_TEMPLATE([$3],[$4])
+
+m4_popdef([FEATURE])dnl
+])
+
+dnl Feature global
+AC_DEFUN([AX_CONFIG_FEATURE_VERBOSE],[ dnl
+ ax_config_feature_verbose=yes
+])
+
+dnl Feature global
+AC_DEFUN([AX_CONFIG_FEATURE_SILENT],[ dnl
+ ax_config_feature_verbose=no
+])
+
+dnl Feature specific
+AC_DEFUN([AX_CONFIG_FEATURE_DEFAULT_ENABLED], [
+ ax_config_feature_[]FEATURE[]_default=yes
+])
+
+dnl Feature specific
+AC_DEFUN([AX_CONFIG_FEATURE_DEFAULT_DISABLED], [
+ ax_config_feature_[]FEATURE[]_default=no
+])
+
+dnl Feature specific
+AC_DEFUN([AX_CONFIG_FEATURE_ENABLE],[ dnl
+ ax_config_feature_[]patsubst([$1], -, _)[]=yes
+])
+
+dnl Feature specific
+AC_DEFUN([AX_CONFIG_FEATURE_DISABLE],[ dnl
+ ax_config_feature_[]patsubst([$1], -, _)[]=no
+])