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+##### http://autoconf-archive.cryp.to/ac_define_dir.html
+#
+# SYNOPSIS
+#
+# AC_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION])
+#
+# DESCRIPTION
+#
+# This macro sets VARNAME to the expansion of the DIR variable,
+# taking care of fixing up ${prefix} and such.
+#
+# VARNAME is then offered as both an output variable and a C
+# preprocessor symbol.
+#
+# Example:
+#
+# AC_DEFINE_DIR([DATADIR], [datadir], [Where data are placed to.])
+#
+# LAST MODIFICATION
+#
+# 2006-10-13
+#
+# COPYLEFT
+#
+# Copyright (c) 2006 Stepan Kasal <kasal@ucw.cz>
+# Copyright (c) 2006 Andreas Schwab <schwab@suse.de>
+# Copyright (c) 2006 Guido U. Draheim <guidod@gmx.de>
+# Copyright (c) 2006 Alexandre Oliva
+#
+# Copying and distribution of this file, with or without
+# modification, are permitted in any medium without royalty provided
+# the copyright notice and this notice are preserved.
+
+AC_DEFUN([AC_DEFINE_DIR], [
+ prefix_NONE=
+ exec_prefix_NONE=
+ test "x$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 ${prefix}. Thus we have to use `eval' twice.
+ eval ac_define_dir="\"[$]$2\""
+ eval ac_define_dir="\"$ac_define_dir\""
+ AC_SUBST($1, "$ac_define_dir")
+ AC_DEFINE_UNQUOTED($1, "$ac_define_dir", [$3])
+ test "$prefix_NONE" && prefix=NONE
+ test "$exec_prefix_NONE" && exec_prefix=NONE
+])