anchor.diff:  with pythonPackages;
   
   let
  -  version = "1.3.0";
  +  version = "1.4.0";
   in buildPythonApplication rec {
     inherit version;
     pname = "pantsbuild.pants";
  
positive.code: 
    src = fetchPypi {
      inherit pname version;
      sha256 = "18fcf9047l9k006wz21g525p1w5avyjabmabh0giyz22xnm8g5gp";
    };
  
    prePatch = ''
  
negative.code:   dontStrip = true;
  
    propagatedBuildInputs = [
      twitter-common-collections setproctitle ansicolors packaging pathspec
      scandir twitter-common-dirutil psutil requests pystache pex docutils
      markdown pygments twitter-common-confluence fasteners pywatchman
      futures cffi subprocess32 contextlib2 faulthandler pyopenssl
    ];
  
    meta = {
  