upgrading to latest samba

[steve%prd.co.uk@localhost (Steve Blinkhorn)]

My Windows 10 box has decided to stop talking to my NetBSD boxes over
samba, so I am trying to upgrade to the most recent version.  But:
 
%pkg_add -U -U samba-4.6.8nb5
pkg_add: Package `samba-4.6.8nb5' conflicts with `tdb-[0-9]*', and
`tdb-1.3.3' is installed.
pkg_add: 1 package addition failed

Is this a regexp/glob thing?   I tried updating tdb first, but that
failed too.

-- 
Steve Blinkhorn <steve%prd.co.uk@localhost>