postgresql requires shm and sem

[Marcus Brinkmann]

Hi,

I successfully compiled postgresql.  For compilation, only a very
small change is required (not using NOFILE).

However, postgresql requires both shared memory and semaphores from
SYSV IPC.  I just thought I'd mention it as an example for a widely
used application requiring those.  It is possible to put emulations
of these features in the postgresql code (however, I don't know if
this has any benefit over implementing them directly).

I will report my small fix and upload any compiled packages,
so if we ever get semaphores (and shared memory), postgresql 
will magically start to work.

Thanks,
Marcus