anchor.diff:    };
   
     propagatedBuildInputs = [ cffi ];
  -  buildInputs = [ pkgs.libspotify ];
  +  buildInputs = [ libspotify ];
   
     # python zip complains about old timestamps
     preConfigure = ''
  
positive.code:     find "$out" -name _spotify.so -exec \
          install_name_tool -change \
          @loader_path/../Frameworks/libspotify.framework/libspotify \
          ${pkgs.libspotify}/lib/libspotify.dylib \
          {} \;
    '';
  
  
negative.code: , buildPythonPackage
  , fetchFromGitHub
  , cffi
  , libspotify
  }:
  
  buildPythonPackage rec {
  