The www.nihn.org master site seems to be gone forever.
The solution to unbreak this port to upgrade to version 3.x, available at:
http://ldapdns.sourceforge.net
Port was reset to facilitate somebody else performing the update.
Sylvio has been MIA for more than a year now.
ldapdns is a lightweight, high performance DNS server
which utilizes LDAP as its backend.
It is originally based on djbdns and strives to maintain
the same goals of performance, security and simplicity.
WWW: http://www.nimh.org/code/ldapdns/
PR: 60965
Submitted by: Paul Dlug <paul@aps.org>