Fix all remaining warnings (missing declarations, missing prototypes)
diff --git a/ip6tables-multi.h b/ip6tables-multi.h
new file mode 100644
index 0000000..551029a
--- /dev/null
+++ b/ip6tables-multi.h
@@ -0,0 +1,8 @@
+#ifndef _IP6TABLES_MULTI_H
+#define _IP6TABLES_MULTI_H 1
+
+extern int ip6tables_main(int, char **);
+extern int ip6tables_save_main(int, char **);
+extern int ip6tables_restore_main(int, char **);
+
+#endif /* _IP6TABLES_MULTI_H */