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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_configure_args.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CONFIGURE_ARGS
+#
+# DESCRIPTION
+#
+# Helper macro for AX_ENABLE_BUILDDIR.
+#
+# The traditional way of starting a subdir-configure is running the script
+# with ${1+"$@"} but since autoconf 2.60 this is broken. Instead we have
+# to rely on eval'ing $ac_configure_args however some old autoconf
+# versions do not provide that. To ensure maximum portability of autoconf
+# extension macros this helper can be AC_REQUIRE'd so that
+# $ac_configure_args will alsways be present.
+#
+# Sadly, the traditional "exec $SHELL" of the enable_builddir macros is
+# spoiled now and must be replaced by "eval + exit $?".
+#
+# Example:
+#
+# AC_DEFUN([AX_ENABLE_SUBDIR],[dnl
+# AC_REQUIRE([AX_CONFIGURE_ARGS])dnl
+# eval $SHELL $ac_configure_args || exit $?
+# ...])
+#
+# LICENSE
+#
+# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 9
+
+AC_DEFUN([AX_CONFIGURE_ARGS],[
+ # [$]@ is unsable in 2.60+ but earlier autoconf had no ac_configure_args
+ if test "${ac_configure_args+set}" != "set" ; then
+ ac_configure_args=
+ for ac_arg in ${1+"[$]@"}; do
+ ac_configure_args="$ac_configure_args '$ac_arg'"
+ done
+ fi
+])