if (di.mtime_cur == f_info.st_mtime) {
di.crc_prev = di.crc_cur;
lyxerr[Debug::DEPEND] << itr->first << " same mtime";
} else {
di.crc_prev = di.crc_cur;
lyxerr[Debug::DEPEND] << itr->first << " CRC... ";
if (di.mtime_cur == f_info.st_mtime) {
di.crc_prev = di.crc_cur;
lyxerr[Debug::DEPEND] << itr->first << " same mtime";
} else {
di.crc_prev = di.crc_cur;
lyxerr[Debug::DEPEND] << itr->first << " CRC... ";