-static void entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, void* userdata) {
+static void entry_group_callback(AVAHI_GCC_UNUSED AvahiServer *s, AVAHI_GCC_UNUSED AvahiSEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void* userdata) {