Index: undo_act.c
===================================================================
--- undo_act.c	(revision 4549)
+++ undo_act.c	(revision 4550)
@@ -41,6 +41,7 @@
 #include "draw.h"
 #include "misc.h"
 #include "layer.h"
+#include "obj_all.h"
 
 /* --------------------------------------------------------------------------- */