--- syshead.h	2011-12-13 08:58:56.000000000 -0800
+++ /Users/wstein/syshead.h	2012-07-29 22:43:48.000000000 -0700
@@ -399,6 +399,10 @@
 #define EXTENDED_SOCKET_ERROR_CAPABILITY 0
 #endif
 
+#if defined(TARGET_DARWIN) && !defined(SOL_IP)
+#define SOL_IP IPPROTO_IP  /* SOL_IP is not defined on OSX Lion */
+#endif /* TARGET_DARWIN && !SOL_IP */
+
 /*
  * Do we have a syslog capability?
  */