[Distutils] Custom "build steps"

[Paul Prescod]

What's the best way to extend distutils with "custom steps" like a call
to an IDL compiler or an M4 pre-process? I could just put all of the
code in my setup.py but it seems very inelegant and not necessarily
always effective (i.e. what if I have to do a post-process between the
build and install step?) Is there a technique I can use?

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