anchor.diff:  
     configureFlags = [
       "--audio-drv-list=${audio}"
  +    "--disable-strip" # We'll strip ourselves after separating debug info.
       "--enable-docs"
       "--enable-tools"
       "--enable-guest-agent"
  
positive.code:   dontUseMesonConfigure = true; # meson's configurePhase isn't compatible with qemu build
  
    outputs = [ "out" "ga" ];
  
    patches = [
      ./fix-qemu-ga.patch
  
negative.code: 
    nativeBuildInputs = [ makeWrapper python python.pkgs.sphinx python.pkgs.sphinx_rtd_theme pkg-config flex bison meson ninja ]
      ++ lib.optionals gtkSupport [ wrapGAppsHook ]
      ++ lib.optionals stdenv.isDarwin [ sigtool ];
  
    buildInputs = [ zlib glib perl pixman
  