anchor.diff:      overrides = self: super: with stage0; rec {
         darwin = super.darwin // {
           Libsystem = stdenv.mkDerivation {
  -          name = "bootstrap-Libsystem";
  +          name = "bootstrap-stage0-Libsystem";
             buildCommand = ''
               mkdir -p $out
               ln -s ${bootstrapTools}/lib $out/lib
  
positive.code:                           libcxx,
                            allowedRequisites ? null}:
      let
        buildPackages = lib.optionalAttrs (last ? stdenv) {
          inherit (last) stdenv;
        };
  
        coreutils = { name = "coreutils-9.9.9"; outPath = bootstrapTools; };
        gnugrep   = { name = "gnugrep-9.9.9";   outPath = bootstrapTools; };
  
        bintools = import ../../build-support/bintools-wrapper {
          inherit shell;
  
negative.code:       inherit binutils binutils-raw;
      };
    in import ../generic rec {
      name = "stdenv-darwin";
  
      inherit config;
      inherit (pkgs.stdenv) fetchurlBoot;
  
      buildPlatform = localSystem;
      hostPlatform = localSystem;
  