pg_upgrade: error when migrating from 8.3 to 9.1

I am trying to upgrade a database from postgresql 8.3.8 to 9.1. (Ubuntu 10.10
Maverick)

It is crashing out with the following error:

Adding support functions to new cluster ok
Restoring database schema to new cluster
"/usr/lib/postgresql/9.1/bin/psql" --set ON_ERROR_STOP=on --no-psqlrc --port
5435 --username "postgres" -f "/var/lib/postgresql/pg_upgrade_dump_db.sql"
--dbname template1 >> "/dev/null"
psql:/var/lib/postgresql/pg_upgrade_dump_db.sql:85146: ERROR: could not
find function "pg_freespacemap_pages" in file
"/usr/lib/postgresql/9.1/lib/pg_freespacemap.so"

The code at line 85146 is as follows:

CREATE FUNCTION pg_freespacemap_pages() RETURNS SETOF record
LANGUAGE c
AS '$libdir/pg_freespacemap', 'pg_freespacemap_pages';

Why does this happen? Any hints how this can be fixed? As a work around, is
it safe to create this function in 9.1 and how do I do that?

Help! Thanks in advance...

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