[Distutils] setuptools special case Pyrex and break Cython

[Phillip J. Eby]

At 06:21 PM 9/3/2007 +0200, Stefan Behnel wrote:
>The point is that current setuptools break developer builds. You
>can't change the sources without having (a fake) Pyrex installed, because
>setuptools will not let you run Cython.

If you want to use the native Extension type, do this:

    from distutils.core import Extension
    from setuptools import setup

Alternately, you can use:

    from setuptools.extension _import Extension as Extension

I will add this information to the existing setuptools documentation 
regarding Pyrex detection.

Meanwhile, if you'd like to suggest a way of detecting Cython's 
presence, I can probably add that to the setuptools.extension module.