You have a misconfiguration problem somewhere. Probably with regards to PL/pgSQL. Try creating in on the "template0" database before procedding to creating the 3.2.5 datamodel.
createlang plpgsql template0
Then comment the PL/pgSQL lines in www/doc/sql/postgres.sql and load the datamodel.
I tested all this before release, but I re-loaded the CVS datamodel just in case, with no errors whatsoever.
325test=# select version();
version
---------------------------------------------------------------
PostgreSQL 7.1.2 on i686-pc-linux-gnu, compiled by GCC 2.95.4
(1 row)
325test=# select count(*) from pg_tables;
count
-------
386
(1 row)