Two issues spotted by Ronald OUssoren:
- there were no accessor functions for the global per-database fields
- packages and their dependencies were installed in order in stead
  of in reverse order.
diff --git a/Lib/plat-mac/Carbon/Qt.py b/Lib/plat-mac/Carbon/Qt.py
index 8a1585a..23d44d2 100644
--- a/Lib/plat-mac/Carbon/Qt.py
+++ b/Lib/plat-mac/Carbon/Qt.py
@@ -1 +1,6 @@
 from _Qt import *
+try:
+    _ = AddFilePreview
+except:
+    raise ImportError, "Old (2.3) _Qt.so module loaded in stead of new (2.4) _Qt.so"
+	
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