ip: make local functions static
diff --git a/ip/ipxfrm.c b/ip/ipxfrm.c
index 5a0f215..db51918 100644
--- a/ip/ipxfrm.c
+++ b/ip/ipxfrm.c
@@ -39,6 +39,7 @@
 
 #include "utils.h"
 #include "xfrm.h"
+#include "ip_common.h"
 
 #define STRBUF_SIZE	(128)
 #define STRBUF_CAT(buf, str) \