XEN kernel config - supposed to build?

I'm building the XEN kernel config on a recent (today) csup of CURRENT,
but I'm getting the following build error:

# make buildkernel KERNCONF=XEN
...
cc -c -O -pipe  -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  -mno-align-long-strings -mpreferred-stack-boundary=2  -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -ffreestanding -fstack-protector -Werror /usr/src/sys/xen/evtchn/evtchn.c
cc1: warnings being treated as errors
/usr/src/sys/xen/evtchn/evtchn.c:653: warning: initialization from incompatible pointer type
*** Error code 1

Is this supposed to be working? Or have I dived randomly in and missed
the pool? :-)

Thanks,

Tim.

-- 
Tim Bishop
http://www.bishnet.net/tim/
PGP Key: 0x5AE7D984