anchor.diff:      xorg.libXScrnSaver
       xorg.libXv
       xorg.libXxf86vm
  -    youtube-dl
  -  ] ++ optional vaapiSupport libva;
  +  ];
   
     postPatch = ''
       patchShebangs ./TOOLS/
  
positive.code: { stdenv
  , docutils
  , fetchurl
  , makeWrapper
  , perl
  
negative.code:   installPhase = ''
      python ${waf} install
    '' + /* Use a standard font */ ''
      mkdir -pv $out/share/mpv
      ln -sv ${freefont_ttf}/share/fonts/truetype/FreeSans.ttf $out/share/mpv/subfont.ttf
    '';
  
    preFixup =
      /* Ensure youtube-dl is available in $PATH for MPV */ ''
        wrapProgram $out/bin/mpv \
          --prefix PATH : "${pythonPackages.youtube-dl}/bin"
      '';
  
    meta = with stdenv.lib; {
  