anchor.diff:  { stdenv
  -, autoreconfHook
   , fetchFromGitHub
   , lib
  +, meson
  +, ninja
   
   #, egl-headers
   , eglexternalplatform
  
positive.code:     opengl-dummy
      wayland
      xorgproto
    ];
  
    configureFlags = [
      "--disable-debug"
    ];
  
    meta = with lib; {
  
negative.code: }:
  
  let
    version = "2018-01-31";
  in
  stdenv.mkDerivation rec {
    name = "egl-wayland-${version}";
  
    src = fetchFromGitHub {
      version = 6;
      owner = "NVIDIA";
      repo = "egl-wayland";
      rev = "68ffe6fff49fff7667e8bab5b743c3e6c1950a6f";
      sha256 = "89f67cc9fd6082466d75449d3b496f2eae3e9dc0fe0f8b79d49c444e6acab9f2";
    };
  
    nativeBuildInputs = [
      meson
      ninja
    ];
  
    buildInputs = [
  