anchor.diff:      NIX_CFLAGS_COMPILE=$(echo "$NIX_CFLAGS_COMPILE" | sed 's,\-isystem ${lib.getDev stdenv.cc.libc}/include,,g')
   
       cat >> LocalConfig.kmk <<LOCAL_CONFIG
  -    VBOX_WITH_VIRTIO               :=
  -
       VBOX_WITH_TESTCASES            :=
       VBOX_WITH_TESTSUITE            :=
       VBOX_WITH_VALIDATIONKIT        :=
  
positive.code:   inherit version;
  
    src = fetchurl {
      url = "https://download.virtualbox.org/virtualbox/${version}/VirtualBox-${version}.tar.bz2";
      sha256 = "91fa05bcfce36316ca93e3927c9550ea66286fff4c5bec900b753fca278ce1a0";
    };
  
    outputs = [ "out" "modsrc" ];
  
negative.code:   # Use maintainers/scripts/update.nix to update the version and all related hashes or
    # change the hashes in extpack.nix and guest-additions/default.nix as well manually.
    version = "6.1.14";
    tarballVersion = "${version}a";
  
    iasl' = iasl.overrideAttrs (old: rec {
      inherit (old) pname;
  