typeidTypeRelid Error

I have checked the bakc archives and can find several references to the
following error, but know fixes.

OS: Linux (kernel v2.2.2)
Distro: YellowDogLinux (Red Hat based)
Arch: PowerPC (not a G3)
PG: 6.4.2

The error is that any operation having to do with oid type's results in an
error, ie:

createdb test
destroydb test
ERROR:   typeidTypeRelid: Invalid type - oid = 0
ERROR:   typeidTupeRelid: Invalid type - oid = 0

Same thing if I load psql and do a \d <tablename>.  I can create databases
and tables and such however.

Ideas?  pg 6.3.x worked on linux ppc platforms previously, but the newer
distros might be using the new glibc.  Would this make a difference?

-JP