--- hash.c.orig	Thu Apr 20 00:18:07 2017
+++ hash.c	Thu Apr 20 00:18:20 2017
@@ -31,6 +31,7 @@ void clear_hash(void)
    memset(hashtable, 0, sizeof(hashtable));
 }
 
+extern int unnamed(u_long);
 inline int unnamed(u_long ip)
 {
    u_char hashval;
