top-level: add uutils-coreutils stdenv

  gccStdenvNoLibs = mkStdenvNoLibs gccStdenv;

  clangStdenvNoLibs = mkStdenvNoLibs clangStdenv;

  stdenvUutilsCoreutils =

    let

      uutils-coreutils = pkgs.uutils-coreutils;

      bintools = wrapBintoolsWith {

        bintools = stdenv.cc.bintools.bintools;

        coreutils = uutils-coreutils;

      };

    in

    stdenv.override {

      cc = stdenv.cc.override {

        coreutils = uutils-coreutils;

        inherit bintools;

      };

      initialPath = (lib.remove coreutils stdenv.initialPath) ++ [ uutils-coreutils ];

      allowedRequisites = lib.mapNullable (

        rs:

        (lib.remove [

          bintools

          expand-response-params

          coreutils

        ] rs)

        ++ [

          bintools

          expand-response-params

          uutils-coreutils

        ]

      ) (stdenv.allowedRequisites or null);

    };

  # For convenience, allow callers to get the path to Nixpkgs.

  path = ../..;