anchor.diff:      beautifulsoup4 html5lib
       PyRSS2Gen pynzb rpyc jinja2
       requests dateutil jsonschema
  -    pathpy guessit APScheduler
  +    pathpy guessit rebulk APScheduler
       terminaltables colorclass
       cherrypy flask flask-restful
       flask-restplus flask-compress
       flask_login flask-cors
       pyparsing zxcvbn-python future
  +    progressbar
       # Optional requirements
       deluge-client
       # Plugins
  
positive.code: 
  buildPythonApplication rec {
    pname = "FlexGet";
    version = "2.17.20";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "a09ef9482ed54f7e96eb8b4d08c59687c5c43a3341c9d2675383693e6c3681c3";
    };
  
    postPatch = ''
      # build for the correct python version
      substituteInPlace setup.cfg --replace $'[bdist_wheel]\npython-tag = py27' ""
      # remove dependency constraints
      sed 's/==\([0-9]\.\?\)\+//' -i requirements.txt
    '';
  
negative.code: # -- Mic92
  
  let
    python' = python3.override { inherit packageOverrides; };
  
    packageOverrides = self: super: {
      guessit = super.guessit.overridePythonAttrs (old: rec {
  