anchor.diff:  , psutil
   , pydot
   , pytest
  +, pytest_xdist
  +, pytest-forked
   , scipy
   , simplejson
   , traits
  
positive.code:     dateutil
      funcsigs
      future
      futures
      networkx
      nibabel
      numpy
  
negative.code:     xvfbwrapper
    ] ++ stdenv.lib.optional (!isPy3k) [
      configparser
      futures
    ];
  
    checkInputs = [ pytest mock pytestcov pytest_xdist pytest-forked codecov which glibcLocales ];
  
    checkPhase = ''
      LC_ALL="en_US.UTF-8" py.test -v --doctest-modules nipype
  