anchor.diff:  , libva
   , libvpx
   , mesa
  -, udev
  +, systemd_lib
   , wayland
   , xorg
   }:
  
positive.code: };
  
  stdenv.mkDerivation rec {
    name = "gstreamer-vaapi-1.6.0";
  
    src = fetchurl {
      url = "https://gstreamer.freedesktop.org/src/gstreamer-vaapi/"
          + "${name}.tar.xz";
      sha256 = "1ljmafyn0kkil6x5iqvbkrvhinlj9l4zzdq4832cdwgm2b1p8i92";
    };
  
    nativeBuildInputs = [
  
negative.code:     libva
      libvpx
      mesa
      systemd_lib
      wayland
      xorg.libX11
      xorg.libXrandr
  