--- a/src/internet-stack/icmpv4-l4-protocol.h	Fri Jun 19 14:12:59 2009 -0700
+++ b/src/internet-stack/icmpv4-l4-protocol.h	Sun Jun 21 22:29:08 2009 -0700
@@ -15,6 +15,8 @@
 {
 public:
   static TypeId GetTypeId (void);
+  static const uint8_t PROT_NUMBER;
+
   Icmpv4L4Protocol ();
   virtual ~Icmpv4L4Protocol ();