Postmaster from 6.5 won't run on Linux 2.2.9

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name               :       Dr. Robert Fargher
Your email address     : fargher@aebc.ocm


System Configuration
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Architecture    : AMD K6-2 300 MHz

Operating System : Red Hat 6.0, 2.2.9 kernel

PostgreSQL version : PostgreSQL-6.5

Compiler used  : egcs-2.91.66


Please enter a FULL description of your problem:
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  PostgresSQL 6.5 seemed to compile OK and install OK.  But
when I try to run postmaster, it doesn't run.

bash$ whoami
postgres
bash$ postmaster -i
IpcMemoryCreate: shmget failed (Invalid argument) key=5432001,
size=1063936, permission=600
FATAL 1:  ShmemCreate: cannot create region