cc  -O2 -Werror -Wall -Wstrict-prototypes -Wmissing-prototypes
-Wpointer-arith -Wno-main -mno-fpu
-I. -I/usr/src/sys/arch -I/usr/src/sys -nostdinc -DSUN4 -DSUN4C -DSUN4M
-DRASTERCONSOLE -DLKM -DNS
-DMAXUSERS=32 -D_KERNEL  -c /usr/src/sys/dev/sbus/cs4231_sbus.c
cc1: warnings being treated as errors
/usr/src/sys/dev/sbus/cs4231_sbus.c: In function `cs4231_trigger_output':
/usr/src/sys/dev/sbus/cs4231_sbus.c:863: warning: pointer of type `void *'
used in subtraction
*** Error code 1

Stop.