anchor.diff:  
     doCheck = false;
   
  -  meta = with stdenv.lib; {
  +  meta = with lib; {
       description = "A library for guessing information from video filenames";
       homepage = https://pypi.python.org/pypi/guessit;
       license = licenses.lgpl3;
  
positive.code: }:
  
  let
    inherit (stdenv.lib)
      optionals;
  
    version = "2.1.0";
  in
  buildPythonPackage rec {
    name = "guessit-${version}";
  
negative.code:   src = fetchPyPi {
      package = "guessit";
      inherit version;
      sha256 = "cdb51ced109e05318f35dc5ee1c50182a85edd800e86de77ec96eb68a0a99391";
    };
  
    nativeBuildInputs = optionals doCheck [
      pytest
      pytest-benchmark
      pytest-capturelog
  