Collecting xlib==0.21
  1 location(s) to search for versions of xlib:
  * https://pypi.python.org/simple/xlib/
  Getting page https://pypi.python.org/simple/xlib/
  Analyzing links from page https://pypi.python.org/simple/xlib/
    Found link https://pypi.python.org/packages/3f/00/321541273b0ed2167b36c82be9baeb0bdc8af1c11c1b01de9436b84b5eaf/xlib-0.21-py2.py3-none-any.whl#md5=11083538c88cd6cd3afb40aaeace0919 (from https://pypi.python.org/simple/xlib/), version: 0.21
    Found link https://pypi.python.org/packages/74/d4/6033a97f96fc7d7bb822dab52e2e3c9532256d7ce033fa9675734941b9ac/xlib-0.21.tar.gz#md5=8d1ccb3b070ae96f20c3750b49ced6b3 (from https://pypi.python.org/simple/xlib/), version: 0.21
  Using version 0.21 (newest of versions: 0.21)
  Downloading xlib-0.21-py2.py3-none-any.whl (123kB)
  Downloading from URL https://pypi.python.org/packages/3f/00/321541273b0ed2167b36c82be9baeb0bdc8af1c11c1b01de9436b84b5eaf/xlib-0.21-py2.py3-none-any.whl#md5=11083538c88cd6cd3afb40aaeace0919 (from https://pypi.python.org/simple/xlib/)
  Saved /tmp/tmpeoniyovz/xlib-0.21-py2.py3-none-any.whl
Skipping xlib, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-build-gx8jy02f/xlib