spamassassin fails to build on 6.0-BETA2

[Martin Smith]

attempting to install amavisd-new on a newly installed 6.0 BETA2, spamassassin 
fails with:
Warning: prerequisite Net::IP 1.2 not found.
Writing Makefile for Net::DNS
==> Your Makefile has been rebuilt. <==
==> Please rerun the make command.  <==
false
*** Error code 1

Stop in /usr/ports/dns/p5-Net-DNS/work/Net-DNS-0.53.
*** Error code 1

Stop in /usr/ports/dns/p5-Net-DNS.
*** Error code 1

Stop in /usr/ports/mail/p5-Mail-SpamAssassin.
*** Error code 1

Net::IP 1.2 does not appear to exist in the ports tree, any offers of where it 
might be found
-- 
Martin