Problem for install ProjeQtor 4.2.3 with Postgresql 8.4

Parameters must be defined in config :
host : server when your database is
port : port to pgsql database (5432 by default for pgsql)
database : an existing database created on pgsql (with utf8 enciding)
user / password : a valid pgsql role granted to create tables on database.

Also check that :
user can access the database and select all tables adn create any type of object (table, sequence)
user must be able to connect to pgsql from PHP server : the rights defined in pg_hba.conf may be very restrictive.