anchor.diff:      ++ lib.optional sambaSupport samba
       ++ lib.optional vdpauSupport libvdpau
       ++ lib.optional pulseSupport libpulseaudio
  -    ++ lib.optional cecSupport libcec
       ++ lib.optional rtmpSupport rtmpdump;
   
       dontUseCmakeConfigure = true;
  
positive.code:       lzo libcdio libmodplug libass libbluray
        sqlite mysql.lib nasm avahi libdvdcss lame
        curl bzip2 zip unzip glxinfo xdpyinfo
      ]
      ++ lib.optional dbusSupport dbus_libs
      ++ lib.optional udevSupport udev
  
negative.code: , rtmpdump ? null, rtmpSupport ? true
  , libvdpau ? null, vdpauSupport ? true
  , libpulseaudio ? null, pulseSupport ? true
  }:
  
  assert dbusSupport  -> dbus_libs != null;
  