+// define symbols that are missing in old versions of Motif.
+#if defined(__VMS) || (XmVersion < 2000)
+#define XtDisplay XTDISPLAY
+#define XmNtoggleMode 0
+#define XmTOGGLE_INDETERMINATE 1
+#define XmTOGGLE_BOOLEAN 2
+#define XmUNSET 3
+#define XmSET 4
+#define XmINDETERMINATE 5
+#endif
+
+