anchor.diff:  , vulkan-headers
   , vulkan-loader
   , xxd
  +, SDL2
  +, makeWrapper
  +, libGL
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:     ninja
      pkg-config
      xxd
    ];
  
    buildInputs = [
  
negative.code:     vulkan-loader
    ];
  
    fixupPhase = ''
      wrapProgram $out/bin/xrgears \
        --prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath [ SDL2 libGL ]}
    '';
  
    meta = with lib; {
      homepage = "https://gitlab.freedesktop.org/monado/demos/xrgears";
      description = "An OpenXR example using Vulkan for rendering";
  