Can be that I was too fast about this. All function etc. has their own name in if_em.c and if_lem.c what I do have problem with when having both these file in the same build are. Multi defines of devclass_t em_devclass. How do I solve this if not extern will do it? It’s in if_em.c like this devclass_t em_devclass; and in if_lem.c extern devclass_t em_devclass; row 315 in the if_em.c file http://svnweb.freebsd.org/base/head/sys/dev/e1000/if_em.c?view=markup row 274 in the if_lem.c file http://svnweb.freebsd.org/base/head/sys/dev/e1000/if_lem.c?view=markup -- MVH Fredrik Modèen