stdenvAdapters.useMoldLinker: set `allowedRequisites` to `null`

      '';

    };

  in stdenv.override (old: {

    cc = stdenv.cc.override {

      inherit bintools;

    };

    allowedRequisites =

      (lib.optional (stdenv.allowedRequisites or null != null) stdenv.allowedRequisites)

        ++ [ bintools pkgs.mold ]

        # need to `outputSpecified = false` to make getLib work

        ++ (builtins.map (p: lib.getLib (p // { outputSpecified = false; })) pkgs.mold.buildInputs);

    allowedRequisites = null;

    cc = stdenv.cc.override { inherit bintools; };

    # gcc >12.1.0 supports '-fuse-ld=mold'

    # the wrap ld above in bintools supports gcc <12.1.0 and shouldn't harm >12.1.0

    # https://github.com/rui314/mold#how-to-use