pgsql

Release = erlang:system_info(otp_release),
case Release of
    [$R | _] when Release =< "R15B01" ->
        HashDefine = [{d,old_hash}],
        case lists:keysearch(erl_opts, 1, CONFIG) of
            {value, {erl_opts, Opts}} ->
                lists:keyreplace(erl_opts,1,CONFIG,{erl_opts,Opts++HashDefine});
            false ->
                CONFIG ++ [{erl_opts, HashDefine}]
        end;
    _ -> CONFIG
end.