Collecting prefopt==0.0.1.dev0
  1 location(s) to search for versions of prefopt:
  * https://pypi.python.org/simple/prefopt/
  Getting page https://pypi.python.org/simple/prefopt/
  Analyzing links from page https://pypi.python.org/simple/prefopt/
    Found link https://pypi.python.org/packages/09/13/cb2c00c0eae49b673cd4becb059b1a6d9c14768c9baac3685b8c63839d80/prefopt-0.0.1.dev0.tar.gz#md5=101d6db141e581acebcbad333cc5b276 (from https://pypi.python.org/simple/prefopt/), version: 0.0.1.dev0
    Found link https://pypi.python.org/packages/79/74/8ebeecbf42623f0ce3fcf6d783bf9ed1b270f991d5d3fc6a7b326409b6c7/prefopt-0.0.1.dev0-py2.py3-none-any.whl#md5=de9d0d1332dfb037ad5d8cfb38e57d4a (from https://pypi.python.org/simple/prefopt/), version: 0.0.1.dev0
  Using version 0.0.1.dev0 (newest of versions: 0.0.1.dev0)
  Downloading prefopt-0.0.1.dev0-py2.py3-none-any.whl
  Downloading from URL https://pypi.python.org/packages/79/74/8ebeecbf42623f0ce3fcf6d783bf9ed1b270f991d5d3fc6a7b326409b6c7/prefopt-0.0.1.dev0-py2.py3-none-any.whl#md5=de9d0d1332dfb037ad5d8cfb38e57d4a (from https://pypi.python.org/simple/prefopt/)
  Saved /tmp/tmpqja5yim9/prefopt-0.0.1.dev0-py2.py3-none-any.whl
Skipping prefopt, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-build-785lne4n/prefopt