anchor.diff:        ++ lib.optional config.networking.networkmanager.enable plasma5.plasma-nm
         ++ lib.optional config.hardware.pulseaudio.enable plasma5.plasma-pa
         ++ lib.optional config.powerManagement.enable plasma5.powerdevil
  -      ++ phononBackendPackages;
  +      ++ lib.optionals cfg.phonon.gstreamer.enable
  +        [
  +          pkgs.phonon_backend_gstreamer
  +          pkgs.gst_all.gstreamer
  +          pkgs.gst_all.gstPluginsBase
  +          pkgs.gst_all.gstPluginsGood
  +          pkgs.gst_all.gstPluginsUgly
  +          pkgs.gst_all.gstPluginsBad
  +          pkgs.gst_all.gstFfmpeg # for mp3 playback
  +          pkgs.phonon_qt5_backend_gstreamer
  +          pkgs.gst_all_1.gstreamer
  +          pkgs.gst_all_1.gst-plugins-base
  +          pkgs.gst_all_1.gst-plugins-good
  +          pkgs.gst_all_1.gst-plugins-ugly
  +          pkgs.gst_all_1.gst-plugins-bad
  +          pkgs.gst_all_1.gst-libav # for mp3 playback
  +        ]
  +      ++ lib.optionals cfg.phonon.vlc.enable
  +        [
  +          pkgs.phonon_qt5_backend_vlc
  +          pkgs.phonon_backend_vlc
  +        ];
   
       environment.pathsToLink = [ "/share" ];
   
  
positive.code:     };
  
      environment.profileRelativeEnvVars =
        mkIf (lib.elem "gstreamer" cfg.phononBackends)
        {
          GST_PLUGIN_SYSTEM_PATH = [ "/lib/gstreamer-0.10" ];
          GST_PLUGIN_SYSTEM_PATH_1_0 = [ "/lib/gstreamer-1.0" ];
  
negative.code:         description = "Enable the Plasma 5 (KDE 5) desktop environment.";
        };
  
        phonon = {
  
          gstreamer = {
            enable = mkOption {
              type = types.bool;
              default = true;
              description = "Enable the GStreamer Phonon backend (recommended).";
            };
          };
  
          vlc = {
            enable = mkOption {
              type = types.bool;
              default = false;
              description = "Enable the VLC Phonon backend.";
            };
          };
  
        };
  
      };
  