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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_expand_prefix.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_EXPAND_PREFIX
#
# DESCRIPTION
#
# When $prefix and $exec_prefix are still set to NONE then set them to the
# usual default values - being based on $ac_default_prefix. - this macro
# can be AC_REQUIREd by other macros that need to compute values for
# installation directories. It has been observed that it was done wrong
# over and over again, so this is a bit more safe to do.
#
# remember - setting exec_prefix='${prefix}' needs you interpolate
# directories multiple times, it is not sufficient to just say
# MYVAR="${datadir}/putter" but you do have to run `eval` a few times,
# sth. like MYVAR=`eval "echo \"$MYVAR\""` done atleast two times.
#
# The implementation of this macro simply picks up the lines that would be
# run at the start of AC_OUTPUT anyway to set the prefix/exec_prefix
# defaults. Between AC_INIT and the first command to AC_REQUIRE this macro
# you can set the two variables to something explicit instead. Probably,
# any command to compute installation directories should be run _after_
# AM_INIT_AUTOMAKE
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 7
AC_DEFUN([AX_EXPAND_PREFIX],[dnl
# The prefix default can be set in configure.ac (otherwise it is /usr/local)
test "x$prefix" = xNONE && prefix=$ac_default_prefix
# Let make expand exec_prefix. Allows to override the makevar 'prefix' later
test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
])
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