proposed rebar change

gistfile1.erl

check_versions(Config) ->
    ErtsRegex = rebar_config:get(Config, require_erts_vsn, ".*"),
    ReOpts = [{capture, none}],
    case re:run(erlang:system_info(version), ErtsRegex, ReOpts) of
        match ->
            ?DEBUG("Matched required ERTS version: ~s -> ~s\n",
                   [erlang:system_info(version), ErtsRegex]);
        nomatch ->
            ?ABORT("ERTS version ~s does not match required regex ~s\n",
                   [erlang:system_info(version), ErtsRegex])
    end,

    OtpRegex = rebar_config:get(Config, require_otp_vsn, ".*"),
    case re:run(erlang:system_info(otp_release), OtpRegex, ReOpts) of
        match ->
            ?DEBUG("Matched required OTP release: ~s -> ~s\n",
                   [erlang:system_info(otp_release), OtpRegex]);
        nomatch ->
            ?ABORT("OTP release ~s does not match required regex ~s\n",
                   [erlang:system_info(otp_release), OtpRegex])
    end,

    MinOtpVers = rebar_config:get(Config, require_min_otp_vsn, nil),
    if
        MinOtpVers /= nil ->
            {MinMaj, MinMin} = case otp_vers_to_tup(MinOtpVers, "configured") of
                                   {Maj, Min} -> {Maj, Min};
                                   Other -> Other
                               end,
            {OtpMaj, OtpMin} = case otp_vers_to_tup(erlang:system_info(otp_release),
                                                    "OTP Release") of
                                   {Maj1, Min1} -> {Maj1, Min1};
                                   Other1 -> Other1
                               end,
            case OtpMaj >= MinMaj andalso OtpMin >= MinMin of
                true ->
                    ?DEBUG("OTP release ~s is later than ~s~n",
                           [erlang:system_info(otp_release), MinOtpVers]);
                false -> 
                    ?ABORT("OTP release ~s is earlier than ~s~n",
                           [erlang:system_info(otp_release), MinOtpVers])
            end;
	MinOtpVers == nil -> ?DEBUG("Min OTP version unconfigured~n", [])
    end.