PostgreSQL 6.4.2 on AIX 4.3.2: typeidTypeRelid error

I've seen several postings about this, but no resolution. I've
filed another bug report.

If someone has a fix for this, let me know.

Thanks.

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : David Favor
Your email address : dfavor(at)corridor(dot)com

Category : runtime: back-end
Severity : critical

Summary: destroydb fails with ERROR: typeidTypeRelid: Invalid type - oid = 0

System Configuration
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Operating System : AIX 432

PostgreSQL version : 6.4.2

Compiler used : gcc version egcs-2.93.08 19990214

Hardware:
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AIX aasc24 3 4 00FFFFFF4C00 (Power PC)

Versions of other tools:
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gmake - 3.77
bison - 1.25
flex - 2.5.4

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Problem Description:
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template1=> create database foo;
CREATEDB
template1=> drop database foo;
ERROR: typeidTypeRelid: Invalid type - oid = 0
ERROR: typeidTypeRelid: Invalid type - oid = 0
template1=> \q