Steve Dower added the comment:
(Obligatory recommendation that you use Cython rather than ctypes, especially if you're going to require your users to have a compiler handy - in general this isn't recommended on Windows at all; make sure you distribute wheels if you want to make your users' lives easiest.)
I haven't tested this, but I believe you want to specify your libraries with the `libraries` parameter, not the `extensions` parameter:
LIBRARIES = [ ('my_lib', {'sources': ['my_lib.c'], 'include_dirs': ['dirs', 'if', 'you', 'want'], 'macros': ['DEFINES', 'IF', 'YOU', 'WANT']}) ]
setup( ... libraries=LIBRARIES, ... )
Then you need to ensure build_clib is run to produce it. I'd imagine that will just happen, but I could be wrong.
Again, I haven't tried this myself, but it seems to be the right way to build a regular library.
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