For duplicate interests keep incoming face !!! Need more thinking
diff --git a/model/ccnx-face.h b/model/ccnx-face.h
index e2100c6..16a31fd 100644
--- a/model/ccnx-face.h
+++ b/model/ccnx-face.h
@@ -27,6 +27,7 @@
 #include "ns3/ptr.h"
 #include "ns3/ccnx.h"
 #include "ns3/nstime.h"
+#include "ns3/type-id.h"
 
 namespace ns3 {