--- config.h.in.orig	2010-12-26 02:19:27.000000000 +0800
+++ config.h.in	2010-12-26 02:20:07.000000000 +0800
@@ -225,7 +225,7 @@
 #undef HAVE_NETINET_IN_H
 
 /* Define to 1 if you have the <net/if.h> header file. */
-#undef HAVE_NET_IF_H
+#define HAVE_NET_IF_H 1
 
 /* Define to 1 if you have the `nl_langinfo' function. */
 #undef HAVE_NL_LANGINFO