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#!/usr/bin/env bash
name='configure' # Luke's configureation script
#version='1.0'
#  Copyright (C) 2009 Luke Shumaker
#  
#  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 2 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;  see the file COPYING.
#  If not, see <http://www.gnu.org/licenses>.

     _prefix='/usr/local'
_exec_prefix='$(prefix)'
     _bindir='$(exec_prefix)/bin'
    _sbindir='$(exec_prefix)/sbin'
 _libexecdir='$(exec_prefix)/libexec'
     _srcdir=$(readlink -f `dirname "$0"`)
vars='prefix exec_prefix bindir sbindir libexecdir srcdir'
if [ -f "$_srcdir/config" ]; then . "$_srcdir/config"; fi

error() {
	echo "$name: $1" >> /dev/stderr
	exit 1
}

args=`getopt -n "$name" -o "${sopt}" -l "${lopt}${vars}" -- "$@"`
if [ $? == 0 ]; then
	set -- $args
	while [ $# -gt 0 ]; do case "$1" in
		--) break;;
		--*)
			var0="${1/--/}"
			match='false'
			for var1 in $vars; do
				if [ "$var0" == "$var1" ]; then
					match='true'
					break;
				fi
			done
			if [ "$match" == 'true' ]; then
				val="$2"
				eval _$var0=$val
			else
				error "option \`$1' not recognized";
			fi
			:;;
		*) error "option \`$1' not recognized";;
	esac
	shift
	done
else
	error 'unable to parse command line arguments'
fi

echo '#!/bin/sed -f' > var.sed
for var in $vars; do
	var1="_$var"
	val=${!var1}
	
	# GNU bash optimized version
		var=${var//':'/'\:'} 
		val=${val//':'/'\:'}
	# POSIX version
		#var=`echo "$var" | sed 's@:@\\:@g'`
		#val=`echo "$val" | sed 's@:@\\:@g'`
	
	echo "s:@$var@:$val:g" >> var.sed
done

Makefiles="`find "${_srcdir}/" -type f -name Makefile.in`"
Makefiles="$Makefiles `find "${_srcdir}/" -type f -name *.mk.in`"
for orig in $Makefiles; do
	new=${orig/%.in/}
	new=${new/#$_srcdir\//}
	mkdir -p `dirname "$new"`
	sed -f var.sed "${orig}" | sed \
-e '19 a# DO NOT edit this file, it has been generated by configure, and will' \
-e "19 a# be overwritten. Instead, edit the file \``basename ${orig}`'" \
-e "19 a
	" > "${new}"
done
rm var.sed