Index: ComboBo.h
--- ComboBo.h.orig
+++ ComboBo.h
@@ -23,7 +23,9 @@
 
 #define XtNselectCallback "selectCallback"
 #define XtNselectMenu "selectMenu"
+#ifndef XtNcancelCallback
 #define XtNcancelCallback "cancelCallback"
+#endif
 #define XtNmargin "margin"
 #define XtNnumberRows "numberRows"
 #define XtNshowDotFiles "showDotFiles"
