RTC_VER_CURRENT
head->ch_version = RTC_VER_CURRENT;
if (head->ch_version > RTC_VER_CURRENT) {
(int)head->ch_version, RTC_VER_CURRENT);
(int)head->ch_version, RTC_VER_CURRENT);
if (head->ch_version > RTC_VER_CURRENT)