Installation problem(Error: unknown type oidvector)

Hi,

During installation  of  Postgresql 7.0.2.  I get the
folowing error
when I try to  initdb.

We are initializing the database system with username postgres
(uid=501).
This user will own all the files and must also own the server
Creating template database in /opt/pgsql/data/base/template1
ERRER: Error: unknown type 'oidvector'

initdb: could not create template database
initdb: cleaning up by wiping out /opt/pgsql/data/base/template1

Could any help?

Thank you in advance

Best regards,

Poul Kristensen
The Danish National  Institute of Social Researcher