Index: gui/gdmsetup.desktop.in.in
===================================================================
--- gui/gdmsetup.desktop.in.in.orig
+++ gui/gdmsetup.desktop.in.in
@@ -4,6 +4,7 @@ _Name=Login Window
 _Comment=Configure GDM login window appearance and behavior
 TryExec=@sbindir@/gdmsetup
 Exec=@sbindir@/gdmsetup
+X-KDE-RootOnly=true
 Icon=gdm-setup
 StartupNotify=true
 Terminal=false