--- src/utils/opp_makemake.in	Sun Jan 23 22:29:17 2005
+++ src/utils/opp_makemake.in	Sun Jan 23 22:29:44 2005
@@ -94,7 +94,7 @@
 
         -u | --userinterface)
         shift
-        userif=`echo $1 | tr [a-z] [A-Z]`
+        userif=`echo $1 | tr '[[:lower:]]' '[[:upper:]]'`
         case "$userif" in
             CMDENV | TKENV)
             ;;