another kernel compiling trouble

cc -c -O2 -pipe -fno-strict-aliasing -march=pentium3 -Wall -Wredundant-decls -Wn
ested-externs -Wstrict-prototypes  -Wmissing-pro
totypes -Wpointer-arith -Winline -Wcast-qual  -fformat-extensions -std=c99  -nos
tdinc -I-  -I. -I/usr/src/sys -I/usr/src/sys/con
trib/dev/acpica -I/usr/src/sys/contrib/altq -I/usr/src/sys/contrib/ipfilter -I/u
sr/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 -I/usr/
src/sys/dev/twa -D_KERNEL -include opt_global.h
-fno-common -finline-limit=8000 --param inline-unit-growth=100 --param large-fun
ction-growth=1000  -mno-align-long-strings -mpre
ferred-stack-boundary=2  -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -ffree
standing -Werror  /usr/src/sys/kern/kern_tc.c
/usr/src/sys/kern/kern_tc.c:74: warning: redundant redeclaration of 'th0'
/usr/src/sys/kern/kern_tc.c:64: warning: previous declaration of 'th0' was here
*** Error code 1

Stop in /usr/obj/usr/src/sys/PSL2.
*** Error code 1

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