Fix setting lib_dir in ip*tables-{save,restore}
diff --git a/include/ip6tables.h b/include/ip6tables.h
index 8360617..d4dadd8 100644
--- a/include/ip6tables.h
+++ b/include/ip6tables.h
@@ -4,6 +4,10 @@
 #include "iptables_common.h"
 #include "libiptc/libip6tc.h"
 
+#ifndef IP6T_LIB_DIR
+#define IP6T_LIB_DIR "/usr/local/lib/iptables"
+#endif
+
 struct ip6tables_rule_match
 {
 	struct ip6tables_rule_match *next;