We should devendor packaging from setuptools. From IRC: <dstufft> By the way, I'm pretty sure that https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=814397 is because pip unbundles and the latest python-pkg-resources doesn't <dstufft> (now that I actually look at setuptools) <dstufft> so pip is using packaging.version.Version and pkg_resources is giving it pkg_resources._vendor.packaging.version.Version [16:48]