buildkernel error

[wsk]

cvsuped src on midnight and got the follow errors on buildkernel.
cc -c -O -pipe -Wall -Wredundant-decls -Wnested-externs
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline
-Wcast-qual -fformat-extensions -std=c99 -g -nostdinc -I- -I.
-I/usr/src/sys -I/usr/src/sys/contrib/dev/acpica
-I/usr/src/sys/contrib/ipfilter -I/usr/src/sys/contrib/pf
-I/usr/src/sys/contrib/dev/ath -I/usr/src/sys/contrib/dev/ath/freebsd
-I/usr/src/sys/contrib/ngatm -D_KERNEL -include opt_global.h -fno-common
-finline-limit=8000 -mno-align-long-strings -mpreferred-stack-boundary=2
-ffreestanding -Werror /usr/src/sys/nfsclient/nfs_node.c
cc -c -O -pipe -Wall -Wredundant-decls -Wnested-externs
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline
-Wcast-qual -fformat-extensions -std=c99 -g -nostdinc -I- -I.
-I/usr/src/sys -I/usr/src/sys/contrib/dev/acpica
-I/usr/src/sys/contrib/ipfilter -I/usr/src/sys/contrib/pf
-I/usr/src/sys/contrib/dev/ath -I/usr/src/sys/contrib/dev/ath/freebsd
-I/usr/src/sys/contrib/ngatm -D_KERNEL -include opt_global.h -fno-common
-finline-limit=8000 -mno-align-long-strings -mpreferred-stack-boundary=2
-ffreestanding -Werror /usr/src/sys/nfsclient/nfs_socket.c
cc -c -O -pipe -Wall -Wredundant-decls -Wnested-externs
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline
-Wcast-qual -fformat-extensions -std=c99 -g -nostdinc -I- -I.
-I/usr/src/sys -I/usr/src/sys/contrib/dev/acpica
-I/usr/src/sys/contrib/ipfilter -I/usr/src/sys/contrib/pf
-I/usr/src/sys/contrib/dev/ath -I/usr/src/sys/contrib/dev/ath/freebsd
-I/usr/src/sys/contrib/ngatm -D_KERNEL -include opt_global.h -fno-common
-finline-limit=8000 -mno-align-long-strings -mpreferred-stack-boundary=2
-ffreestanding -Werror /usr/src/sys/nfsclient/nfs_subs.c
/usr/src/sys/nfsclient/nfs_subs.c: In function `nfs_uninit':
/usr/src/sys/nfsclient/nfs_subs.c:438: warning: implicit declaration of
function `TAILQ_ISEMPTY'
*** Error code 1

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

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

Stop in /usr/src.