problems on solaris 7

Hi!
I've installed 7.1.2 on sparc solaris 7.
configure, make, install and initdb worked perfectly.
When I try to start postmaster:

postgres$ postmaster
IpcMemoryCreate: shmget(key=5432001, size=1245184, 03600) failed: Invalid argument

I've read in administrator's guide to put the following lines in /etc/system:

set shmsys:shminfo_shmmax=0x2000000
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=256
set shmsys:shminfo_shmseg=256
set semsys:seminfo_semmap=256
set semsys:seminfo_semmni=512
set semsys:seminfo_semmns=512
set semsys:seminfo_semmsl=32

Since then postmaster starts, but when I try to use psql, createuser or createdb they drop segmentation fault. (when
tryingto use psql with a nonexisting database - i.e. other than template1 - it works fine: reports the error and
exits).Regression check also fails at createdb with segfault. 

I suppose this is a problem in my solaris settings and not in postgres, but I'm not an expert of kernel level solaris
configuration.Could anyone help me please?! I'm running out of time. 

thanks, Peter