--- libnet-1.1.5/configure.orig	Sat Dec 17 16:17:23 2011
+++ libnet-1.1.5/configure	Sat Dec 17 16:18:25 2011
@@ -21763,6 +21763,13 @@
 
         ;;
 
+    5.10|5.11|5.12)
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_SOLARIS_IPV6 1
+_ACEOF
+
+        ;;
+
     esac
 
     ADDITIONAL_LIBS='-lresolv -lsocket -lnsl'