Drawing a line to the scope of Python packaging

[dstufft (Donald Stufft)]

@msarahan

How does pip track compatibility with software such as scikit-learn that is built against the numpy C API? Scikit-learn is nominally compatible back to numpy 1.8 (which is amazing), but in actuality, it works out to be whatever numpy version is used at compile time as a baseline.

I would expect the resulting wheel to have a requirement on >=$NUMPY_I_BUILT_AGAINST. There’s no requirement that the build depends and install depends have the same version range.