anchor.diff:  
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "18fcf9047l9k006wz21g525p1w5avyjabmabh0giyz22xnm8g5gp";
  +    sha256 = "1jd041av1kipg4psbcwk70nwh0bsh5mkbjjcmnw4vrqdd09vg1gz";
     };
   
     prePatch = ''
  
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: with pythonPackages;
  
  let
    version = "1.4.0";
  in buildPythonApplication rec {
    inherit version;
    pname = "pantsbuild.pants";
  