--- a/src/proto2/NetworkAddress.hh	Tue Nov 18 22:58:50 2008 +0000
+++ b/src/proto2/NetworkAddress.hh	Thu Nov 20 19:25:56 2008 +0000
@@ -5,4 +5,7 @@
 
 typedef CL_IPAddress NetworkAddress;
 
+// Network.cc
+std::ostream& operator<< (std::ostream &s, const NetworkAddress &addr);
+
 #endif /* NETWORK_ADDRESS_HH */