anchor.diff:          inherit config shell extraBuildInputs;
   
           extraNativeBuildInputs = extraNativeBuildInputs ++ lib.optionals doUpdateAutoTools [
  -          last.pkgs.updateAutotoolsGnuConfigScriptsHook last.pkgs.gnu-config
  +          last.pkgs.updateAutotoolsGnuConfigScriptsHook
  +          last.pkgs.gnu-config
           ];
   
           allowedRequisites = if allowedRequisites == null then null else allowedRequisites ++ [
  -          cc.expand-response-params cc.bintools
  +          cc.expand-response-params
  +          cc.bintools
           ] ++ lib.optionals doUpdateAutoTools [
  -          last.pkgs.updateAutotoolsGnuConfigScriptsHook last.pkgs.gnu-config
  +          last.pkgs.updateAutotoolsGnuConfigScriptsHook
  +          last.pkgs.gnu-config
           ] ++ lib.optionals doSign [
             last.pkgs.darwin.postLinkSignHook
             last.pkgs.darwin.sigtool
  
positive.code:     outputHashMode = "recursive";
    });
  
    stageFun = step: last: {shell             ? "${bootstrapTools}/bin/bash",
                            overrides         ? (self: super: {}),
                            extraPreHook      ? "",
                            extraNativeBuildInputs,
                            extraBuildInputs,
                            libcxx,
                            allowedRequisites ? null}:
      let
        name = "bootstrap-stage${toString step}";
  
  
negative.code:           inherit lib shell;
            inherit (last) stdenvNoCC;
  
            nativeTools = false;
            nativeLibc = false;
            inherit buildPackages libcxx;
            inherit (last.pkgs) coreutils gnugrep;
            bintools = last.pkgs.darwin.binutils;
            libc = last.pkgs.darwin.Libsystem;
            isClang = true;
            cc = last.pkgs."${finalLlvmPackages}".clang-unwrapped;
          }; in args // (overrides args)
        );
  
        cc = if last == null then "/dev/null" else
        mkCC ({ cc, ... }: {
          extraPackages = [
            last.pkgs."${finalLlvmPackages}".libcxxabi
            last.pkgs."${finalLlvmPackages}".compiler-rt
  