Index: undo.h
===================================================================
--- undo.h	(revision 5024)
+++ undo.h	(revision 5025)
@@ -79,27 +79,29 @@
  * define supported types of undo operations
  * note these must be separate bits now
  */
-#define	UNDO_CHANGENAME			0x0001	/* change of names */
-#define	UNDO_MOVE			0x0002		/* moving objects */
-#define	UNDO_REMOVE			0x0004	/* removing objects */
-#define	UNDO_REMOVE_POINT		0x0008	/* removing polygon/... points */
-#define	UNDO_INSERT_POINT		0x0010	/* inserting polygon/... points */
-#define	UNDO_REMOVE_CONTOUR		0x0020	/* removing a contour from a polygon */
-#define	UNDO_INSERT_CONTOUR		0x0040	/* inserting a contour from a polygon */
-#define	UNDO_ROTATE			0x0080	/* rotations */
-#define	UNDO_CREATE			0x0100	/* creation of objects */
-#define	UNDO_MOVETOLAYER		0x0200	/* moving objects to */
-#define	UNDO_FLAG			0x0400		/* toggling SELECTED flag */
-#define	UNDO_CHANGESIZE			0x0800	/* change size of object */
-#define	UNDO_CHANGE2NDSIZE		0x1000	/* change 2ndSize of object */
-#define	UNDO_MIRROR			0x2000	/* change side of board */
-#define	UNDO_CHANGECLEARSIZE		0x4000	/* change clearance size */
-#define	UNDO_CHANGEMASKSIZE		0x8000	/* change mask size */
-#define	UNDO_CHANGEANGLES	       0x10000	/* change arc angles */
-#define	UNDO_LAYERCHANGE	       0x20000	/* layer new/delete/move */
-#define	UNDO_CLEAR		       0x40000	/* clear/restore to polygons */
-#define	UNDO_NETLISTCHANGE	       0x80000	/* netlist change */
-#define	UNDO_CHANGEPINNUM			0x100000	/* change of pin number */
-#define	UNDO_CHANGERADII	    0x200000	/* change arc radii */
+typedef enum {
+	UNDO_CHANGENAME        = 0x000001, /* change of names */
+	UNDO_MOVE              = 0x000002, /* moving objects */
+	UNDO_REMOVE            = 0x000004, /* removing objects */
+	UNDO_REMOVE_POINT      = 0x000008, /* removing polygon/... points */
+	UNDO_INSERT_POINT      = 0x000010, /* inserting polygon/... points */
+	UNDO_REMOVE_CONTOUR    = 0x000020, /* removing a contour from a polygon */
+	UNDO_INSERT_CONTOUR    = 0x000040, /* inserting a contour from a polygon */
+	UNDO_ROTATE            = 0x000080, /* rotations */
+	UNDO_CREATE            = 0x000100, /* creation of objects */
+	UNDO_MOVETOLAYER       = 0x000200, /* moving objects to */
+	UNDO_FLAG              = 0x000400, /* toggling SELECTED flag */
+	UNDO_CHANGESIZE        = 0x000800, /* change size of object */
+	UNDO_CHANGE2NDSIZE     = 0x001000, /* change 2ndSize of object */
+	UNDO_MIRROR            = 0x002000, /* change side of board */
+	UNDO_CHANGECLEARSIZE   = 0x004000, /* change clearance size */
+	UNDO_CHANGEMASKSIZE    = 0x008000, /* change mask size */
+	UNDO_CHANGEANGLES      = 0x010000, /* change arc angles */
+	UNDO_LAYERCHANGE       = 0x020000, /* layer new/delete/move */
+	UNDO_CLEAR             = 0x040000, /* clear/restore to polygons */
+	UNDO_NETLISTCHANGE     = 0x080000, /* netlist change */
+	UNDO_CHANGEPINNUM      = 0x100000, /* change of pin number */
+	UNDO_CHANGERADII       = 0x200000  /* change arc radii */
+} pcb_undo_op_t;
 
 #endif