Kernel from today does not build any more

After cvsup my CURRENT amd64 systems today I am not able to build custom 
kernel any more. Does anyone else observes the following breakage?

===> bwn (all)
cc -O2 -pipe -fno-strict-aliasing -Werror -D_KERNEL -DKLD_MODULE 
-nostdinc   -DHAVE_KERNEL_OPTION_HEADERS -include 
/usr/obj/usr/src/sys/RHURLIN/opt_global.h -I. -I_at_ -I_at_/contrib/altq 
-finline-limit=8000 --param inline-unit-growth=100 --param 
large-function-growth=1000 -fno-common  -fno-omit-frame-pointer 
-I/usr/obj/usr/src/sys/RHURLIN -mcmodel=kernel -mno-red-zone 
-mfpmath=387 -mno-sse -mno-sse2 -mno-sse3 -mno-mmx -mno-3dnow 
-msoft-float -fno-asynchronous-unwind-tables -ffreestanding 
-fstack-protector -std=iso9899:1999 -fstack-protector -Wall 
-Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef 
-Wno-pointer-sign -fformat-extensions -c 
/usr/src/sys/modules/bwn/../../dev/bwn/if_bwn.c
cc1: warnings being treated as errors
/usr/src/sys/modules/bwn/../../dev/bwn/if_bwn.c: In function 'bwn_tsf_read':
/usr/src/sys/modules/bwn/../../dev/bwn/if_bwn.c:10384: warning: unused 
variable 'sc'
*** Error code 1
Stop in /usr/src/sys/modules/bwn.
*** Error code 1
Stop in /usr/src/sys/modules.
*** Error code 1
...

Thanks in advance,
Rainer Hurling