pg_upgrade / postgis issue

so my problem is that i have pg8.3 + postgis 1.3.x and i want to upgrade both
of em to pg9.2.4 + postgis 2.0.4.

so i've installed pg9.2.4 with postgis 2.0.4 and the server is running in a
different port (5433) so both servers are up and running (not a big deal).

when i try to pg_upgrade it gives me an error that pg_upgrade was expecting
that some libraries provided by postgis extensions were installed so did a
bit of research and i was missing this two "commands" from the postgis
installation guide:

CREATE EXTENSION postgis;
CREATE EXTENSION postgis_topology;

so everything went "well" after that, my pg_upgrade was able to advance a
little more, but suddenly it gives me this error

New cluster database "postgres" is not empty
Failure, exiting

obviously i went to psql and saw that the database "postgres" was not empty
and was filled with 3 relations :

Schema | Name | Type | Owner
----------+-----------------+-------+----------
public | spatial_ref_sys | table | postgres
topology | layer | table | postgres
topology | topology | table | postgres

that were added by the 2 psql commands i just mention (that installed the
extensions i was missing from the past)

so im stuck here and i really need help or if someone could tell where to
contact the postgis people.

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