diff -Nur uuid-0.9.0/uuid_cli.c uuid-0.9.0-ma1/uuid_cli.c
--- uuid-0.9.0/uuid_cli.c	2004-01-10 11:49:00.000000000 +0100
+++ uuid-0.9.0-ma1/uuid_cli.c	2004-01-12 15:19:21.000000000 +0100
@@ -129,7 +129,7 @@
                 }
                 break;
             default:
-                usage("invalid option '%c'", ch);
+                usage("invalid option '%c'", optopt);
         }
     }
     argv += optind;