sphinx>=1.6.2,!=1.6.6,!=1.6.7,<2.0.0;python_version=='2.7' # BSD
sphinx>=1.6.2,!=1.6.6,!=1.6.7,!=2.1.0;python_version>='3.4' # BSD
openstackdocstheme>=1.20.0 # Apache-2.0