anchor.diff:  { stdenv, fetchgit, fetchFromGitHub, cmake, pkgconfig, git, python3,
     python3Packages, glslang, spirv-tools, x11, libxcb, libXrandr,
  -  libXext, wayland, mesa_noglu }:
  +  libXext, wayland, mesa_noglu, makeWrapper }:
   
   let
     version = "1.0.39.1";
  
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:     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";
  