Pavel Zlatovratskii

It seems you have no Cython installed. Error appears when you try to compile pre-cythonized pngfilters.c and have compilation environment which is not able to compile python modules at all...

Anyway I'll change logging level to be clean that compilation is optional before next release. https://github.com/Scondo/purepng/blob/master/setup.py#L52

I've tried to found more gentle way, but after all use @brechtm way. https://github.com/Scondo/purepng/commit/fb5b8305f0cb24290c157e2d893951d699f74073

Check 0.2.0