README for XFree86 3.3.2 on OpenBSD : Kernel Support for X : MIT-SHM
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8.2. MIT-SHM

OpenBSD supports System V shared memory. If XFree86 detects this support in your kernel, it will support the MIT-SHM extension.

To add support for system V shared memory to your kernel add the lines:

 # System V-like IPC
 options         SYSVMSG
 options         SYSVSEM
 options         SYSVSHM

to your kernel config file. Then from /sys/arch/i386/config, type:

 # rm -f ../compile/<KERNEL-NAME>/*
 # config <KERNEL-NAME>
 # cd ../compile/<KERNEL-NAME>
 # make depend 
 # make

Then install your new kernel and re-boot:

 # cp /bsd /obsd
 # cp bsd /
 # reboot


README for XFree86 3.3.2 on OpenBSD : Kernel Support for X : MIT-SHM
Previous: Aperture Driver
Next: Rebuilding the XFree86 Distribution