anchor.diff:    pname = "pyspotify";
     version = "2.1.3";
   
  -  src = fetchurl {
  -    url = "https://github.com/mopidy/pyspotify/archive/v${version}.tar.gz";
  -    sha256 = "1y1zqkqi9jz5m9bb2z7wmax7g40c1snm3c6di6b63726qrf26rb7";
  +  src = fetchFromGitHub {
  +    owner = "mopidy";
  +    repo = "pyspotify";
  +    rev = "v${version}";
  +    sha256 = "sha256-CjIRwSlR5HPOJ9tp7lrdcDPiKH3p/PxvEJ8sqVD5s3Q=";
     };
   
     propagatedBuildInputs = [ cffi ];
  
positive.code: { lib, stdenv
  , buildPythonPackage
  , fetchurl
  , cffi
  , pkgs
  }:
  
negative.code:   doCheck = false;
  
    meta = with lib; {
      homepage = "http://pyspotify.mopidy.com";
      description = "A Python interface to Spotify’s online music streaming service";
      license = licenses.unfree;
      maintainers = with maintainers; [ lovek323 ];
      platforms = platforms.unix;
    };
  
  }
  