The following bug has been logged on the website:
Bug reference: 11161
Logged by: kern.ipc.semmap has been removed after FreeBSD 9
Email address: amutu@amutu.com
PostgreSQL version: 9.3.5
Operating system: FreeBSD 9.0+
Description:
the doc 17.4.1 should be update for this.
more info:
http://lists.freebsd.org/pipermail/freebsd-stable/2012-March/066957.html