echo 'Creating brew-patch.diff'
cat << EOF >> brew-patch.diff
diff --git a/chcase b/chcase
index 689fc79..93efae8
--- a/chcase
+++ b/chcase
@@ -1,3 +1,4 @@
+#!/bin/sh -- # -*- perl -*-
 eval 'exec perl $0 ${1+"$@"}'
 if 0;
 # don't modify below here
EOF