Got the following while making a new kernel, supped from 12/25 sources:

cc -O -DCOMPAT_SUNOS  -D_KERNEL -D_LKM -I. 
-I/home/paul/src/sys/lkm/compat/sunos -I/home/paul/src/sys
-I/home/paul/src/sys/arch -Werror  -c
/home/paul/src/sys/compat/sunos/sunos_misc.c
cc1: warnings being treated as errors
/home/paul/src/sys/compat/sunos/sunos_misc.c: In function
`sunos_sys_stime':
/home/paul/src/sys/compat/sunos/sunos_misc.c:125: warning: passing arg 2
of `copyout' discards `const' from pointer target type
*** Error code 1

Stop.