Does FreeBSD support System V IPC primitives?

Frequently Asked Questions for FreeBSD 2.X : System Administration : Does FreeBSD support System V IPC primitives?
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8.17. Does FreeBSD support System V IPC primitives?

Yes, FreeBSD supports System V-style IPC. This includes shared memory, messages and semaphores. You need to add the following lines to your kernel config to enable them.

        options    SYSVSHM
        options    "SHMMAXPGS=64"   # 256Kb of sharable memory
        options    SYSVSEM          # enable for semaphores
        options    SYSVMSG          # enable for messaging

Recompile and install.

NOTE: You may need to increase SHMMAXPGS to some ridiculous number like 4096 (16M!) if you want to run GIMP. 256Kb is plenty for X11R6 shared memory.