QTimeZone::systemTimeZoneId() fails on FreeBSD

consider reading /var/db/zoneinfo which might or might not be present or equal to /etc/localtime see man tzinfo. Note that /etc/localtime is a copy not a symlink on FreeBSD.

#include <QTimeZone>

int main() {
QTimeZone::systemTimeZoneId();
}

gives:

Unable to determine system time zone: please check your system configuration.