Here's what I get from sources supped friday pm:

cc  -O2 -Werror -Wall -Wstrict-prototypes -Wmissing-prototypes -mno-fpu -I. -I../../../../arch -I../../../.. -nostdinc -DSUN4C -DRASTERCONSOLE -DKTRACE -DSYSVMSG -DSYSVSEM -DSYSVSHM -DLKM -DCOMPAT_43 -DCOMPAT_10 -DCOMPAT_11 -DCOMPAT_12 -DCOMPAT_13 -DCOMPAT_SUNOS -DCOMPAT_SVR4 -DNFSSERVER -DQUOTA -DFIFO -DINET -DGATEWAY -DNS -DISO -DTPIP -DEON -DNETATALK -DNTP -DIPFILTER_LOG -DMAXUSERS=32 -D_KERNEL  -c ../../../../miscfs/union/union_vnops.c
cc1: warnings being treated as errors
../../../../miscfs/union/union_vnops.c: In function `union_access':
../../../../miscfs/union/union_vnops.c:714: warning: `vp' might be used uninitialized in this function
../../../../miscfs/union/union_vnops.c:733: warning: `vp' might be used uninitialized in this function
*** Error code 1

Stop.

Brad