--- coreutils-5.92/tests/group-names.chgrp	2005-10-28 09:20:12.000000000 +0100
+++ coreutils-5.92/tests/group-names	2005-10-28 09:55:27.000000000 +0100
@@ -18,3 +18,11 @@
      (exit 77); exit 77
      ;;
 esac
+
+set `id -Gn`
+if echo "$2" | grep -q '[^0-9]'
+then
+  exit 0
+else
+  (exit 77); exit 77
+fi