anchor.diff:      xvfbwrapper
     ] ++ stdenv.lib.optional (!isPy3k) [
       configparser
  +    futures
     ];
   
  -  checkInputs = [ pytest mock pytestcov codecov which glibcLocales ];
  +  checkInputs = [ pytest mock pytestcov pytest_xdist pytest-forked codecov which glibcLocales ];
   
     checkPhase = ''
       LC_ALL="en_US.UTF-8" py.test -v --doctest-modules nipype
  
positive.code:   postPatch = ''
      substituteInPlace nipype/interfaces/base/tests/test_core.py \
        --replace "/usr/bin/env bash" "${bash}/bin/bash"
  
      rm pytest.ini
    '';
  
    propagatedBuildInputs = [
  
negative.code:     dateutil
      funcsigs
      future
      networkx
      nibabel
      numpy
  