anchor.diff:  { stdenv
   , fetchurl
   , lib
  +#, meson
  +#, ninja
   
   , libdrm
   , libx11
  
positive.code: }:
  
  let
    inherit (lib)
      boolEn;
  
    driverDir = "${opengl-dummy.driverSearchPath}/lib/dri";
  
    version = "2.2.0";
  in
  stdenv.mkDerivation rec {
    name = "libva-${version}";
  
negative.code:         + "${name}.tar.bz2")
      ];
      hashOutput = false;
      sha256 = "99263056c21593a26f2ece812aee6fe60142b49e6cd46cb33c8dddf18fc19391";
    };
  
    #nativeBuildInputs = [
    #  meson
    #  ninja
    #];
  
    buildInputs = [
      libdrm
  