--- a/src/internet-stack/wscript	Sun Nov 15 11:30:20 2009 +0100
+++ b/src/internet-stack/wscript	Wed Nov 18 08:57:32 2009 +0100
@@ -127,6 +127,8 @@
         'sequence-number.h',
         'icmpv4.h',
         'icmpv6-header.h',
+        # used by routing
+        'ipv4-interface.h',
         'ipv4-l3-protocol.h',
         'ipv6-l3-protocol.h',
         'ipv6-extension-header.h',