Previous versions of the package give _bitcoind a nonexistent home
directory, causing errors when using the rc script in certain situations.
This can't be fixed by updating the package alone.
N.B.: if you've EVER installed bitcoin, wait for the package mirrors to
update with bitcoin-0.16.2p1, and then run the following:
# pkg_delete bitcoin
# userdel _bitcoind
After doing so, you can safely re-add the package.
noticed by tb@
d9e1ed70f3