Cannot redeclare class wddb in wp-db.php in line 53

I would iike to configure WP with postgres. I have an existing postgres database and have apache2.2 running on Windows XP. I downloaded WP and pg4wp. I have moved db.php to wp-content\ folder. I have specified the name, login/password for postgres in wp-config.sh. When I try to run the install.php, I get error 500. The apache log shows “Cannot redeclare class wddb in wp-db.php in line 53”.

I am new to WP. Appreciate any help with this. We are evaluatin moving our web apps from symfony to worpress:

1) pg4wp_SHOWTABLES.log:

Converting :
SHOW TABLES
—- to —-
SELECT tablename FROM pg_tables WHERE schemaname = ‘public’;
———————
Converting :
SHOW TABLES
—- to —-
SELECT tablename FROM pg_tables WHERE schemaname = ‘public’;
———————
Converting :
SHOW TABLES
—- to —-
SELECT tablename FROM pg_tables WHERE schemaname = ‘public’;
———————

pg4wp_unmodified.log:
SET NAMES ‘utf8’
———————
SELECT option_name, option_value FROM wp_options WHERE autoload = ‘yes’
———————
SELECT option_name, option_value FROM wp_options
———————
SELECT option_value FROM wp_options WHERE option_name = ‘siteurl’
———————
SET NAMES ‘utf8’
———————
SELECT option_value FROM wp_options WHERE option_name = ‘siteurl’
———————
SELECT option_value FROM wp_options WHERE option_name = ‘cron’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘cron’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘cron’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ’embed_autourls’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘siteurl’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘siteurl’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘home’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘siteurl’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘active_plugins’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘hack_file’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘cron’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘permalink_structure’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘category_base’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘tag_base’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘template’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘stylesheet’ LIMIT 1
———————
SELECT option_value FROM wp_options WHERE option_name = ‘siteurl’
———————
SELECT option_value FROM wp_options WHERE option_name = ‘use_smilies’ LIMIT 1
———————