Index: head/sys/contrib/ipfilter/netinet/ip_compat.h
===================================================================
--- head/sys/contrib/ipfilter/netinet/ip_compat.h
+++ head/sys/contrib/ipfilter/netinet/ip_compat.h
@@ -32,7 +32,11 @@
 # define 	__KERNEL__
 #endif
 
-#define	SOLARIS	(defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#if defined(sun) && (defined(__svr4__) || defined(__SVR4))
+# define	SOLARIS		1
+#else
+# define	SOLARIS		0
+#endif
 
 
 #if defined(__SVR4) || defined(__svr4__) || defined(__sgi)