Hi, looks like a long due change switch to default on current: https://lists.freebsd.org/archives/freebsd-net/2024-November/005983.html Not sure it is due to this change, because the error message is about undeclared identifier: if_em.c:4485:30: error: use of undeclared identifier 'M_HASFCS' 4485 | rxbuf->m_head->m_flags &= ~M_HASFCS; /* we strip it */ | ^ | ^