vi /etc/rc.d/rc.local add :
 su -l postgres -s /bin/sh -c "/usr/local/pgsql/bin/pg_ctl start -D /usr/local/pgsql/data -l /usr/local/pgsql/log/pgsql.log"
or su -l postgres -s /bin/sh -c "/usr/local/pgsql/bin/postmaster -i -D /usr/local/pgsql/data>> /usr/local/pgsql/log/pgsql.log 2>&1 &"