dnl @synopsis AC_DEFINE_DIR_(VARNAME, DIR [, DESCRIPTION])
dnl
dnl This macro _AC_DEFINEs 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: ac_define_dir_.m4,v 1.1.1.1 2001/07/26 00:46 ac-archive-0.5.39 $
dnl @author Guido Draheim <guidod@gmx.de>, from _AC_DEFINE_DIR by oliva@

AC_DEFUN([AC_DEFINE_DIR_], [
  test "x$prefix" = xNONE && prefix="$ac_default_prefix"
  test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
  ac_define_dir=`eval "echo [$]$2"`
  ac_define_dir=`eval "echo [$]ac_define_dir"`
  ifelse($3, ,dnl
    AC_DEFINE_UNQUOTED($1, "$ac_define_dir"),dnl
    AC_DEFINE_UNQUOTED($1, "$ac_define_dir", $3))
])