--- openflow-2010-09-11.h	2015-07-23 09:54:15.920479312 -0700
+++ openflow-2010-09-12.h	2015-07-23 09:54:15.924479312 -0700
@@ -615,9 +615,9 @@
 };
 
 /* Group mod (controller/switch) */
-struct ofp_group_mod {
+/* struct ofp_group_mod {
 
-}
+} */
 
 /* Values for 'type' in ofp_error_message.  These values are immutable: they
  * will not change in future versions of the protocol (although new values may