kernel compile fails without AH_SUPPORT_AR5416

Sam,

What is the reason to have this option in the kernel config if kernel 
compilation fails when this option is enabled? It also affects 7-stable.

cc -c -O2 -frename-registers -pipe -fno-strict-aliasing  -std=c99 -g 
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef 
-Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/usr/src/sys 
-I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS 
-include opt_global.h -fno-common -finline-limit=8000 --param 
inline-unit-growth=100 --param large-function-growth=1000 
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx 
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding 
-Werror  /usr/src/sys/dev/ath/if_ath.c -I/usr/src/sys/dev/ath
/usr/src/sys/dev/ath/if_ath.c: In function 'ath_rx_tap':
/usr/src/sys/dev/ath/if_ath.c:3414: error: 'const struct ath_rx_status' 
has no member named 'rs_flags'
/usr/src/sys/dev/ath/if_ath.c:3416: error: 'const struct ath_rx_status' 
has no member named 'rs_flags'

-Maxim