BOOTP* or NFS changes break buildkernel

linking kernel.debug
bootp_subr.o(.text+0x1f0e): In function `bootpc_init':
/usr/src/sys/nfsclient/bootp_subr.c:1660: undefined reference to `nfs_diskless_valid'
bootp_subr.o(.text+0x222b):/usr/src/sys/nfsclient/bootp_subr.c:1746: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x2275):/usr/src/sys/nfsclient/bootp_subr.c:1750: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x234c):/usr/src/sys/nfsclient/bootp_subr.c:1776: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x2358):/usr/src/sys/nfsclient/bootp_subr.c:1776: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x2366):/usr/src/sys/nfsclient/bootp_subr.c:1776: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x2374):/usr/src/sys/nfsclient/bootp_subr.c:1776: more undefined references to `nfsv3_diskless' follow
bootp_subr.o(.text+0x23aa): In function `bootpc_init':
/usr/src/sys/nfsclient/bootp_subr.c:1782: undefined reference to `nfs_diskless_valid'
bootp_subr.o(.text+0x23bf):/usr/src/sys/nfsclient/bootp_subr.c:1785: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x23d1):/usr/src/sys/nfsclient/bootp_subr.c:1786: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x23f3):/usr/src/sys/nfsclient/bootp_subr.c:1787: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x2415):/usr/src/sys/nfsclient/bootp_subr.c:1788: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x2422):/usr/src/sys/nfsclient/bootp_subr.c:1791: undefined reference to `nfsv3_diskless'
bootp_subr.o(.text+0x24d5): In function `md_mount':
/usr/src/sys/nfsclient/bootp_subr.c:1823: undefined reference to `krpc_portmap'
bootp_subr.o(.text+0x24f1):/usr/src/sys/nfsclient/bootp_subr.c:1826: undefined reference to `xdr_string_encode'
bootp_subr.o(.text+0x2527):/usr/src/sys/nfsclient/bootp_subr.c:1829: undefined reference to `krpc_call'
bootp_subr.o(.text+0x256e):/usr/src/sys/nfsclient/bootp_subr.c:1841: undefined reference to `krpc_portmap'
bootp_subr.o(.text+0x258e):/usr/src/sys/nfsclient/bootp_subr.c:1846: undefined reference to `xdr_string_encode'
bootp_subr.o(.text+0x25c4):/usr/src/sys/nfsclient/bootp_subr.c:1849: undefined reference to `krpc_call'
bootp_subr.o(.text+0x26ef):/usr/src/sys/nfsclient/bootp_subr.c:1887: undefined reference to `krpc_portmap'
*** Error code 1

Stop in /usr/obj/usr/src/sys/MOBILE.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
-- 
Steve