problems with build on Linux

I built postgres on Linux 6.0 and am having the following problem when
I'm running the regression tests. Postmaster is running. Can you give
me some ideas what this might be? Thanks.

-tom

=============== Notes... =================
postmaster must already be running for the regression tests to succeed.
The time zone is now set to PST8PDT explicitly by this regression test
client frontend. Please report any apparent problems to
ports(at)postgresql(dot)org
See regress/README for more information.

=============== destroying old regression database... =================
=============== creating new regression database... =================
=============== installing PL/pgSQL... =================
ERROR: Index pg_type_oid_index is not a btree
Cannot install language
createlang failed

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom D. Bullers
Telecommunications Services
University of Iowa Hospitals & Clinics
200 Hawkins Dr. GH C132
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voice: (319)384-9762 fax: (319)384-8777
mailto:tom-bullers(at)uiowa(dot)edu