According to the "Zabbix Life Cycle & Release Policy" (http://www.zabbix.com/life_cycle_and_release_policy) the Zabbix 2.4 is EOL in 2016 year.
I'll take it.
A commit references this bug: Author: dbaio Date: Mon May 29 21:45:54 UTC 2017 New revision: 442033 URL: https://svnweb.freebsd.org/changeset/ports/442033 Log: Remove net-mgmt/zabbix24-(agent|frontend|proxy|server) Upstream has declared this version EoL in 2016 (Q1) PR: 219563 Submitted by: Pakhom Golynga <pg@pakhom.spb.ru> (maintainer) Approved by: garga (mentor) Differential Revision: https://reviews.freebsd.org/D10949 Changes: head/MOVED head/net-mgmt/Makefile head/net-mgmt/zabbix24-agent/ head/net-mgmt/zabbix24-frontend/ head/net-mgmt/zabbix24-proxy/ head/net-mgmt/zabbix24-server/
Committed, thanks.