static wxChar wxFileFunctionsBuffer[4*_MAXPATHLEN];
+#if defined(__VISAGECPP__) && __IBMCPP__ >= 400
+//
+// VisualAge C++ V4.0 cannot have any external linkage const decs
+// in headers included by more than one primary source
+//
+const off_t wxInvalidOffset = (off_t)-1;
+#endif
+
// ============================================================================
// implementation
// ============================================================================