That patch did not work, dur to a bug in the original script, here is one that does.
--- build/mkdvdiso.sh.orig 2005-04-09 18:03:56.000000000 +0100 +++ build/mkdvdiso.sh 2005-04-09 18:17:05.000000000 +0100 @@ -33,7 +33,7 @@ mkdir -p $LOOP mkdir -p $DVD
-if [ !`ls $1/*.iso 2>&1>/dev/null ; echo $?` ]; then +if [ ! `ls $1/*.iso > /dev/null 2>&1; echo $?` ]; then echo "Found ISO CD images..." CDS=`expr 0` DISKS="1"