Step 2 in putting the MacOS toolbox modules in a package: issue a DepracationWarning in the compatibility modules.
diff --git a/Mac/Lib/lib-compat/Icons.py b/Mac/Lib/lib-compat/Icons.py
index 2a310c0..d211a2a 100644
--- a/Mac/Lib/lib-compat/Icons.py
+++ b/Mac/Lib/lib-compat/Icons.py
@@ -1 +1,4 @@
+import warnings
+warnings.warn("The %s module is deprecated; use Carbon.%s"%(__name__, __name__),
+	DeprecationWarning, stacklevel=2)
 from Carbon.Icons import *