--- src/utils/opp_makemake.in.orig	2006-10-21 16:43:59.000000000 +0200
+++ src/utils/opp_makemake.in	2008-04-06 14:33:13.000000000 +0200
@@ -254,7 +254,7 @@
 
         -u | --userinterface)
         shift
-        userif=`echo $1 | tr '[a-z]' '[A-Z]'`
+        userif=`echo $1 | tr '[[:lower:]]' '[[:upper:]]'`
         case "$userif" in
             CMDENV | TKENV)
             ;;