initdb problems

I'm on a RedHat6.1 box. I've built from RC4 (all sources from
tarball). Builds/installs just fine, but when trying to do an initdb,
I get this:
[postgres(at)ioport postgres]$ initdb --pglib=$PWD/lib --pgdata=$PWD/data

We are initializing the database system with username postgres (uid=17).
This user will own all the files and must also own the server process.

Creating template database in /home/postgres/data/base/template1
ERROR: Error: unknown type 'oidvector'.

ERROR: Error: unknown type 'oidvector'.

syntax error 12 : parse errorinitdb: could not create template database
initdb: cleaning up by wiping out /home/postgres/data/base/template1

Perhaps something needs to be looked at before release...

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