I have a simple application to calculate MD5 sums for Macintosh 
files with resource forks. BuildApplication includes a whole raft of 
modules, such as httplib, that seem to be unrelated to my 
application. My imports are:

import sys, os
import md5
import EasyDialogs
import MacOS
import Carbon.File as macfs

Apologies if this is a known limitation, but I didn't see it mentioned 
anywhere.