anchor.diff:    # 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;
  
positive.code:     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        :=
  
negative.code:   inherit version;
  
    src = fetchurl {
      url = "https://download.virtualbox.org/virtualbox/${version}/VirtualBox-${tarballVersion}.tar.bz2";
      sha256 = "16f3cb83ab3c4dacf2a9d3cc638cbd18db23767828bba6b8ba1c1b57abeb6aef";
    };
  
    outputs = [ "out" "modsrc" ];
  