Macro: ac_define_dir_

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# ac_define_dir_

## Synopsis

`AC_DEFINE_DIR_(VARNAME, DIR [, DESCRIPTION])`

## Version

1.1.1.1 (2001/07/26) guidod @ ac-archive-0.5.32

## Author

Guido Draheim <guidod@gmx.de>, from _AC_DEFINE_DIR by oliva@

## Description

This macro _AC_DEFINEs VARNAME to the expansion of the DIR variable, taking care of fixing up ${prefix} and such.

Note that the 3 argument form is only supported with autoconf 2.13 and later (i.e. only where _AC_DEFINE supports 3 arguments).

Examples:

`AC_DEFINE_DIR_(DATADIR, datadir)`
`AC_DEFINE_DIR_(PROG_PATH, bindir, [Location of installed binaries])`

## M4 Source Code

    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))
    ])