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dnl @synopsis AC_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION])
dnl
dnl This macro defines (with AC_DEFINE) VARNAME to the expansion of the DIR
dnl variable, taking care of fixing up ${prefix} and such.
dnl
dnl Note that the 3 argument form is only supported with autoconf 2.13 and
dnl later (i.e. only where AC_DEFINE supports 3 arguments).
dnl
dnl Examples:
dnl
dnl    AC_DEFINE_DIR(DATADIR, datadir)
dnl    AC_DEFINE_DIR(PROG_PATH, bindir, [Location of installed binaries])
dnl
dnl @version $Id: define_dir.m4,v 1.1 2012/05/29 12:08:38 misho Exp $
dnl @author Alexandre Oliva <oliva@lsd.ic.unicamp.br>

AC_DEFUN([AC_DEFINE_DIR], [
	ac_expanded=`(
	    test "x$prefix" = xNONE && prefix="$ac_default_prefix"
	    test "x$exec_prefix" = xNONE && exec_prefix="${prefix}"
	    eval echo \""[$]$2"\"
	)`
	ifelse([$3], [],
	  AC_DEFINE_UNQUOTED([$1], ["$ac_expanded"]),
	  AC_DEFINE_UNQUOTED([$1], ["$ac_expanded"], [$3]))
])