Kernel does not build on 10.0-CURRENT (amd64)

I am getting the following error when trying to build recent 
10.0-CURRENT kernel (amd64)?

[..snip..]
cc -O2 -pipe -O2 -fno-strict-aliasing -pipe -msse3 -Werror -D_KERNEL 
-DKLD_MODULE -nostdinc  -I. -I/usr/src/sys/modules/ath/../../dev/ath 
-I/usr/src/sys/modules/ath/../../dev/ath/ath_hal 
-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  -mno-sse -mcmodel=kernel -mno-red-zone 
-mno-mmx -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  -Wmissing-include-dirs 
-fdiagnostics-show-option    -c 
/usr/src/sys/modules/ath/../../dev/ath/if_ath_tx.c
/usr/src/sys/modules/ath/../../dev/ath/if_ath_tx.c: In function 
'ath_tx_aggr_comp_aggr':
/usr/src/sys/modules/ath/../../dev/ath/if_ath_tx.c:3136: error: 'struct 
ath_tx_status' has no member named 'ts_flags'
/usr/src/sys/modules/ath/../../dev/ath/if_ath_tx.c:3139: error: 'struct 
ath_tx_status' has no member named 'ts_ba_low'
/usr/src/sys/modules/ath/../../dev/ath/if_ath_tx.c:3140: error: 'struct 
ath_tx_status' has no member named 'ts_ba_high'
/usr/src/sys/modules/ath/../../dev/ath/if_ath_tx.c:3156: error: 'struct 
ath_tx_status' has no member named 'ts_tid'
/usr/src/sys/modules/ath/../../dev/ath/if_ath_tx.c:3158: error: 'struct 
ath_tx_status' has no member named 'ts_tid'
*** Error code 1
Stop in /usr/src/sys/modules/ath.
*** Error code 1


I observe this behaviour on three boxes. Any help is really appreciated.

Thanks in advance,
Rainer Hurling