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BuildApplication includes all modules that could possibly be needed by 
recursively inspecting all modules for their imports.In your case I guess 
EasyDialogs or os somehow indirectly caused httplib to be included.

This process can be controlled (you can forcibly include or exclude 
modules) by adding :macfreeze: directives to your source code, but this 
is not documented, really.

Look in :Mac:Tools:macfreeze for the code that does it, you may be able 
to infer how it is done.