MacOS X Shared Buffers (SHMMAX)?

Good day,

Does anyone have any experience in increasing the amount of shared memory
buffers available to Mac OS X/Darwin? When starting with more than 128
backend connections on a test G3 I encounter:

-----------------------------------------------------------------------------------
IpcMemoryCreate: shmget(key=5432001, size=33357824, 03600) failed: Invalid argument

This error usually means that PostgreSQL's request for a shared memory
segment exceeded your kernel's SHMMAX parameter.  You can either
reduce the request size or reconfigure the kernel with larger SHMMAX.
-----------------------------------------------------------------------------------

However, I can find no helpful information looking around for how Darwin
handles this configuration. Hopefully it does not require a recompile of
the Kernel. ;)

Any knowledge on this topic would be greatly appreciated.

Best Regards,
Jw.
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