case <<1:16/native>> of
    <<1,0>> ->
        CONFIG;
    <<0,1>> ->
        CXXFLAGS = [{"CXXFLAGS", "$CXXFLAGS -DWORDS_BIGENDIAN"}],
        case lists:keyfind(port_env, 1, CONFIG) of
            false ->
                CONFIG ++ [{port_env, CXXFLAGS}];
            {K, V} ->
                lists:keyreplace(K, 1, CONFIG, {K, V ++ CXXFLAGS})
        end
end.