configure

#!/bin/sh

prefix='/usr'

while [ -n "$1" ]; do
	e="`expr "$1" : '--\(.*=.*\)'`"
	if [ -z "$e" ]; then
		cat<<EOF
Usage: $0 [OPTIONS]
Option		Description				Default
--prefix=...	Directories to put files in		$prefix
EOF
		exit;
	fi
	
	keyname=$(expr "$e" : '\(.*\)=.*' | sed 's/[^a-z0-9_]/_/g')
	value=$(expr "$e" : '.*=\(.*\)' | sed "s/'/_/g")
	
	eval "$keyname='$value'"
	shift;
done

sed -i "1a\PREFIX=$prefix" Makefile