anchor.diff:      google-chrome-env = self.buildEnv  {
         name = "googleChromeEnv";
         paths = with self; [
  -        google-chrome
  +        google-chrome_stable
  +        google-chrome_beta
  +        google-chrome_unstable
         ];
       };
   
  
positive.code:     #emacs = self.emacs.override {
      #  withX = false;
      #};
      pulseaudio_full = self.pulseaudio_full.override {
        loopbackLatencyMsec = "20";
        resampleMethod = "speex-float-5";
      };
      /*python36Packages = self.python36Packages // {
        oauthlib = self.python36Packages.oauthlib.override {
          doCheck = false;
        };
      };
      python3Packages = self.python3Packages.override rec {
        python = self.python36;
        self = self.python36Packages;
      };*/
      #rtorrent = self.rtorrent.override {
        #  colorSupport = true;
        #};
  
negative.code:         lame
          #libpng
          libvpx_head
          libvpx_next # AV1/AOMedia
          python3Packages.beets
          python3Packages.pycountry
          cdrtools
  