Index: main_act.c
===================================================================
--- main_act.c	(revision 17684)
+++ main_act.c	(revision 17685)
@@ -41,6 +41,7 @@
 
 #include "undo.h"
 #include "compat_nls.h"
+#include "change.h"
 #include "board.h"
 #include "data.h"
 #include "crosshair.h"