Cython and pyyaml is breaking many builds

I struggled with the name of the post, sorry =/

Edit: I had originally wanted to go with something more dramatic like "cython and pyyaml breaks the python ecosystem" but decided on something more realistic. I have never seen a issue get upvoted so fast. In 40mins it had 100+ upvotes. Thought the HN community would enjoy a shortcut to the problem and the work-around fix.