1# ===========================================================================
2#     http://www.gnu.org/software/autoconf-archive/ax_expand_prefix.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_EXPAND_PREFIX
8#
9# DESCRIPTION
10#
11#   When $prefix and $exec_prefix are still set to NONE then set them to the
12#   usual default values - being based on $ac_default_prefix. - this macro
13#   can be AC_REQUIREd by other macros that need to compute values for
14#   installation directories. It has been observed that it was done wrong
15#   over and over again, so this is a bit more safe to do.
16#
17#   remember - setting exec_prefix='${prefix}' needs you interpolate
18#   directories multiple times, it is not sufficient to just say
19#   MYVAR="${datadir}/putter" but you do have to run `eval` a few times,
20#   sth. like MYVAR=`eval "echo \"$MYVAR\""` done atleast two times.
21#
22#   The implementation of this macro simply picks up the lines that would be
23#   run at the start of AC_OUTPUT anyway to set the prefix/exec_prefix
24#   defaults. Between AC_INIT and the first command to AC_REQUIRE this macro
25#   you can set the two variables to something explicit instead. Probably,
26#   any command to compute installation directories should be run _after_
27#   AM_INIT_AUTOMAKE
28#
29# LICENSE
30#
31#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
32#
33#   This program is free software; you can redistribute it and/or modify it
34#   under the terms of the GNU General Public License as published by the
35#   Free Software Foundation; either version 3 of the License, or (at your
36#   option) any later version.
37#
38#   This program is distributed in the hope that it will be useful, but
39#   WITHOUT ANY WARRANTY; without even the implied warranty of
40#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
41#   Public License for more details.
42#
43#   You should have received a copy of the GNU General Public License along
44#   with this program. If not, see <http://www.gnu.org/licenses/>.
45#
46#   As a special exception, the respective Autoconf Macro's copyright owner
47#   gives unlimited permission to copy, distribute and modify the configure
48#   scripts that are the output of Autoconf when processing the Macro. You
49#   need not follow the terms of the GNU General Public License when using
50#   or distributing such scripts, even though portions of the text of the
51#   Macro appear in them. The GNU General Public License (GPL) does govern
52#   all other use of the material that constitutes the Autoconf Macro.
53#
54#   This special exception to the GPL applies to versions of the Autoconf
55#   Macro released by the Autoconf Archive. When you make and distribute a
56#   modified version of the Autoconf Macro, you may extend this special
57#   exception to the GPL to apply to your modified version as well.
58
59#serial 7
60
61AC_DEFUN([AX_EXPAND_PREFIX],[dnl
62  # The prefix default can be set in configure.ac (otherwise it is /usr/local)
63  test "x$prefix" = xNONE && prefix=$ac_default_prefix
64  # Let make expand exec_prefix. Allows to override the makevar 'prefix' later
65  test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
66])
67