buildworld fails: spa_maxblocksize

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So the ztest link fails looking for spa_maxblocksize, which
is defined in

sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c

I don't see which lib it is included in. One of zpool, zfs,
or zfs_core, apparently.

As my build system is root on zfs, I am a bit nervous about
just installing those (shouldn't buildworld take care of
this?)

It looks to me that my buildworld environment is reaching
out to the exterior system, is that right?  I have set

export MAKEOBJDIRPREFIX=/usr/obj

before invoking buildworld, but it doesn't help.

Ideas?

Thanks,
Russell
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