try erlang:monotonic_time() of
    _Time -> 
        Opt = {d, 'MONOTONIC_TIME'},
        case lists:keytake(erl_opts, 1, CONFIG) of
            false                 -> [{erl_opts, [Opt]}|CONFIG];
            {value, Opts, Config} -> [{erl_opts, [Opt|Opts]}|Config]
        end
catch
    error:undef ->
        CONFIG 
end.