don't you read port-sparc anymore?  :-)
   
   cc  -O2 -Werror -Wall -Wstrict-prototypes -Wmissing-prototypes  -Wpointer-arith -Wno-main -mno-fpu -I. -I../../../../arch -I../../../.. -nostdinc -DSUN4C -DSUN4M -DRASTERCONSOLE -DRAS
TERCONSOLE_FGCOL="WSCOL_BLACK" -DRASTERCONSOLE_BGCOL="WSCOL_WHITE" -DLKM -DNS -DMAXUSERS=32 -D_KERNEL  -c param.c
   cc1: warnings being treated as errors
   In file included from param.c:48:
   ../../../../sys/systm.h:196: warning: conflicting types for built-in function `memcmp'
   ../../../../sys/systm.h:197: warning: conflicting types for built-in function `memcpy'
   ../../../../sys/systm.h:199: warning: conflicting types for built-in function `memset'
   *** Error code 1


the compiler was changed to be compatible with what the sparc64 port
needs.  'size_t' changed.  it's still the same size, though, with the
same semantics on the sparc port :)

you can either upgrade your compiler now, or, remove the -Werror from
the kernel Makefile until you do so.  you can remove the -Werror from
userland compiles by seeing NOGCCERROR=1.