anchor.diff:  
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "7c0a1206594c615fce0a7f6daa4ea1028645bc20afa5599c2cf0ad7c06223fa7";
  +    sha256 = "0ahvcj33xribypgyh515mb3ack1djr0cq27nlyk0qhwgwv6acfnj";
     };
   
     prePatch = ''
  
positive.code: with pythonPackages;
  
  let
    version = "1.5.0";
  in buildPythonApplication rec {
    inherit version;
    pname = "pantsbuild.pants";
  
negative.code:     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 wheel
    ];
  
    meta = {
  