unable to build kernel, lock_classes related

With the sources cvsupped an hour ago from cvsup12, I encounter the
following problem when trying to build kernel

linking kernel.debug
kern_mutex.o(.text+0x2ea): In function `mtx_destroy':
/usr/src/sys/kern/kern_mutex.c:889: undefined reference to `lock_classes'
subr_lock.o(.text+0x14): In function `lock_init':
/usr/src/sys/kern/subr_lock.c:71: undefined reference to `lock_classes'

Jiawei Ye
--
"Without the userland, the kernel is useless."
               --inspired by The Tao of Programming