--- configure.orig	2006-12-06 11:48:56.000000000 -0600
+++ configure	2010-07-17 22:45:40.000000000 -0500
@@ -32,7 +32,7 @@
   case "$i" in
     --prefix=*) PREFIX=`echo $i | sed 's/--prefix=//'`;;
     *) echo "Unknown option: $i"
-       exit;;
+       exit 1;;
   esac
 done