Index: engine/liberty.h
--- engine/liberty.h.orig
+++ engine/liberty.h
@@ -857,8 +857,8 @@ struct worm_data {
 extern struct worm_data worm[BOARDMAX];
 
 /* Unconditionally meaningless moves. */
-int meaningless_black_moves[BOARDMAX];
-int meaningless_white_moves[BOARDMAX];
+extern int meaningless_black_moves[BOARDMAX];
+extern int meaningless_white_moves[BOARDMAX];
 
 /* Surround cache (see surround.c) */
 
