freebsd-spec.h is a bit out of date with what FreeBSD bundle in their gcc. Attached is a patch to sync things up.
-- Summary: [PATCH] Sync FreeBSD target with upstream Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: uberlord at gentoo dot org GCC build triplet: i686-gentoo-freebsd6.2 GCC host triplet: i686-gentoo-freebsd6.2 GCC target triplet: i686-gentoo-freebsd6.2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33416