sparc64 world crosscompile
--------------------------

i386# export MAKEOBJDIRPREFIX=/usr/obj/sparc64
i386# make buildworld buildkernel TARGET_ARCH=sparc64 KERNCONF=U5

sparc64# chflags -R 0 / /var /usr

i386# mount sparc64:/ /mnt
i386# mount sparc64:/var /mnt/var
i386# mount sparc64:/usr /mnt/usr
i386# make installkernel installworld TARGET_ARCH=sparc64 \
    DESTDIR=/mnt KERNCONF=U5

sparc64# mergemaster