Index: undo.h
===================================================================
--- undo.h	(revision 3142)
+++ undo.h	(revision 3143)
@@ -68,8 +68,8 @@
 bool Undoing(void);
 
 /* Publish actions - these may be useful for other actions */
-int ActionUndo(int argc, char **argv, Coord x, Coord y);
-int ActionRedo(int argc, char **argv, Coord x, Coord y);
-int ActionAtomic(int argc, char **argv, Coord x, Coord y);
+int ActionUndo(int argc, const char **argv, Coord x, Coord y);
+int ActionRedo(int argc, const char **argv, Coord x, Coord y);
+int ActionAtomic(int argc, const char **argv, Coord x, Coord y);
 
 #endif