anchor.diff:  with pythonPackages;
   
   let
  -  version = "1.3.0";
  +  version = "1.4.0";
   in buildPythonApplication rec {
     inherit version;
     pname = "pantsbuild.pants";
  
positive.code:   dontStrip = true;
  
    propagatedBuildInputs = [
      twitter-common-collections setproctitle setuptools six ansicolors
      packaging pathspec scandir twitter-common-dirutil psutil requests
      pystache pex docutils markdown pygments twitter-common-confluence
      fasteners coverage pywatchman futures cffi
    ];
  
    meta = {
  
negative.code: 
    src = fetchPypi {
      inherit pname version;
      sha256 = "1jd041av1kipg4psbcwk70nwh0bsh5mkbjjcmnw4vrqdd09vg1gz";
    };
  
    prePatch = ''
  