host@host~$ pip install -e git+https://github.com/html5lib/html5lib-python.git#egg=html5libObtaining html5lib from git+https://github.com/html5lib/html5lib-python.git#egg=html5lib  Cloning https://github.com/html5lib/html5lib-python.git to ./src/html5lib    Complete output from command python setup.py egg_info:    error in html5lib setup command: Invalid environment marker: platform_python_implementation == 'CPython'    ----------------------------------------Command "python setup.py egg_info" failed with error code 1 in /home/foo_eins_d/src/html5lib

user@host:~$  pip --versionpip 7.1.2 from /home/foo_eins_d/local/lib/python2.7/site-packages (python 2.7)