anchor.diff: -{ stdenv, fetchurl
  +{ stdenv
   , docutils
  +, fetchurl
   , makeWrapper
   , perl
   , pkgconfig
  
positive.code:     youtube-dl
    ] ++ optional vaapiSupport libva;
  
    buildPhase = ''
      python ${waf} build
    '';
  
    installPhase = ''
      python ${waf} install
  
      # Use a standard font
      mkdir -p $out/share/mpv
      ln -s ${freefont_ttf}/share/fonts/truetype/FreeSans.ttf $out/share/mpv/subfont.ttf
  
      # Ensure youtube-dl is available in $PATH for MPV
      wrapProgram $out/bin/mpv --prefix PATH : "${youtube-dl}/bin"
    '';
  
    enableParallelBuilding = true;
  
    meta = with stdenv.lib; {
      description = "A media player that supports many video formats";
      homepage = http://mpv.io;
      license = licenses.gpl2Plus;
      maintainers = with maintainers; [ ];
      platforms = platforms.linux;
    };
  }
  
negative.code:     sha256 = "0cqjwl0xyg0sv1jflipfkvqjg32y0kqfh4gc3lyhqgv0hgs3fa84";
    };
  
    nativeBuildInputs = [
      docutils
      makeWrapper
  