anchor.diff:      numpy
       packaging
     ]
  -  ++ lib.optionals ( !isPy3k ) [ futures ];
  +  ++ lib.optionals ( isPy27 ) [
  +    futures
  +  ];
   
     checkPhase = ''
       ${python.interpreter} -m unittest discover -s bokeh/tests
  
positive.code: 
    disabled = isPyPy;
  
    checkInputs = [ mock pytest pillow selenium ];
  
    propagatedBuildInputs = [
      pillow
  
negative.code: 
    src = fetchPypi {
      inherit pname version;
      sha256 = "1rywd6c6hi0c6yg18j5zxssjd07a5hafcd21xr3q2yvp3aj3h3f6";
    };
  
    patches = [
  