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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_define_dir.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION])
+#
+# DESCRIPTION
+#
+# This macro sets VARNAME to the expansion of the DIR variable, taking
+# care of fixing up ${prefix} and such.
+#
+# VARNAME is then offered as both an output variable and a C preprocessor
+# symbol.
+#
+# Example:
+#
+# AX_DEFINE_DIR([DATADIR], [datadir], [Where data are placed to.])
+#
+# LICENSE
+#
+# Copyright (c) 2008 Stepan Kasal <kasal@ucw.cz>
+# Copyright (c) 2008 Andreas Schwab <schwab@suse.de>
+# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+# Copyright (c) 2008 Alexandre Oliva
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 6
+
+AU_ALIAS([AC_DEFINE_DIR], [AX_DEFINE_DIR])
+AC_DEFUN([AX_DEFINE_DIR], [
+ prefix_NONE=
+ exec_prefix_NONE=
+ test "x$prefix" = xNONE && prefix_NONE=yes && prefix=$ac_default_prefix
+ test "x$exec_prefix" = xNONE && exec_prefix_NONE=yes && exec_prefix=$prefix
+dnl In Autoconf 2.60, ${datadir} refers to ${datarootdir}, which in turn
+dnl refers to ${prefix}. Thus we have to use `eval' twice.
+ eval ax_define_dir="\"[$]$2\""
+ eval ax_define_dir="\"$ax_define_dir\""
+ AC_SUBST($1, "$ax_define_dir")
+ AC_DEFINE_UNQUOTED($1, "$ax_define_dir", [$3])
+ test "$prefix_NONE" && prefix=NONE
+ test "$exec_prefix_NONE" && exec_prefix=NONE
+])