xthread/xindex not enabled or tested.
Makefile will need revising after new bsd.port.mk
dependence on pre-configure target is broken, DEPENDS is a comment for now.
Now it also contains the following fixes...
silence nntpxmit stats which was causing 'sendbatches' to complain and
give up after successfully sending the first batch.
'mkov' no longer dumps core if there is no Xref: header.