anchor.diff:      mkdir -p $demos/bin
       cp demos/*.spv demos/*.ppm $demos/bin
       find demos -type f -executable -not -name vulkaninfo -exec cp {} $demos/bin \;
  -   '';
  +    for p in cube cubepp; do
  +      wrapProgram $demos/bin/$p --run "cd $demos/bin"
  +    done
  +  '';
   
     meta = with stdenv.lib; {
       description = "LunarG Vulkan loader";
  
positive.code:   name = "vulkan-loader-${version}";
    inherit version src;
  
    buildInputs = [ cmake pkgconfig git python3 python3Packages.lxml
                    glslang spirv-tools x11 libxcb libXrandr libXext wayland
                  ];
  
negative.code: { stdenv, fetchgit, fetchFromGitHub, cmake, pkgconfig, git, python3,
    python3Packages, glslang, spirv-tools, x11, libxcb, libXrandr,
    libXext, wayland, mesa_noglu, makeWrapper }:
  
  let
    version = "1.0.39.1";
  