anchor.diff:        export PATH_LOCALE=${pkgs.darwin.locale}/share/locale
       '';
   
  +    extraBuildInputs = with pkgs; [ xz darwin.CF libcxx ];
  +
       allowedRequisites =
         [ bootstrapTools ] ++
         (with pkgs; [ xz libcxx libcxxabi icu ]) ++
  
positive.code:   stageFun = step: last: {shell             ? "${bootstrapTools}/bin/sh",
                            overrides         ? (pkgs: {}),
                            extraPreHook      ? "",
                            extraBuildInputs  ? with last.pkgs; [ xz darwin.CF libcxx ],
                            extraInitialPath  ? [],
                            allowedRequisites ? null}:
      let
        thisStdenv = import ../generic {
  
negative.code:           ${commonPreHook}
            ${extraPreHook}
          '';
          initialPath  = [ bootstrapTools ];
          fetchurlBoot = import ../../build-support/fetchurl {
            stdenv = stage0.stdenv;
            curl   = bootstrapTools;
  