--- a
+++ b/jython/CPythonLib/plat-mac/Carbon/Qt.py
@@ -0,0 +1,5 @@
+from _Qt import *
+try:
+    _ = AddFilePreview
+except:
+    raise ImportError, "Old (2.3) _Qt.so module loaded in stead of new (2.4) _Qt.so"