Need some shmget advice

Architecture:    Solaris 2.6 Sparc
Compiler:    gcc 2.95.1
postgres version    postgres-v6.5.3

I am getting this no matter what value I pass to postmaster -B.  There is
something else going on here.  I did have some problems with the compile but
got the problems worked out.  Any suggestions?

IpcMemoryCreate: shmget failed (Invalid argument) key=5432010, size=120,
permission=700
IpcMemoryIdGet: shmget failed (No such file or directory) key=5432010,
size=120, permission=0
IpcMemoryAttach: shmat failed (Invalid argument) id=-2
FATAL 1:  AttachSLockMemory: could not attach segment

Regards,
Drew Hamilton