Index: trunk/src/undo.c
===================================================================
--- trunk/src/undo.c	(revision 16524)
+++ trunk/src/undo.c	(revision 16525)
@@ -267,3 +267,14 @@
 	uundo_dump(&pcb_uundo, NULL, NULL);
 }
 #endif
+
+void pcb_undo_freeze_serial(void)
+{
+	uundo_freeze_serial(&pcb_uundo);
+}
+
+void pcb_undo_unfreeze_serial(void)
+{
+	uundo_unfreeze_serial(&pcb_uundo);
+}
+
Index: trunk/src/undo.h
===================================================================
--- trunk/src/undo.h	(revision 16524)
+++ trunk/src/undo.h	(revision 16525)
@@ -50,6 +50,8 @@
 uundo_serial_t pcb_undo_serial(void);
 void pcb_undo_truncate_from(uundo_serial_t sfirst);
 
+void pcb_undo_freeze_serial(void);
+void pcb_undo_unfreeze_serial(void);
 
 /* Returns 0 if undo integrity is not broken */
 int undo_check(void);