Stumped - MDB2 & pgsql

I need to switch from MySQL (where everything is peachy) to Postgresql - reason I need to switch is I need to use PostGIS and I don't see a need to run two databases. I got Postgresql installed (stock CentOS / RHEL 5) and installed the postgresql php module and mdb2 driver. Restarted the web server. Did a MySQL dump, ran it through a perl script, and managed to get it load into Postgresql without any apparent hickups. I can connect to postgresql and issue queries and expected results are in fact returned. Made a user called webuser (what, you expect the real name to be disclosed here ??) in postgresql and gave it a password and access to the database. Updated the data/pg_hba.conf to add the following line:

local    mydbname webuser   127.0.0.1         password

restarted the postgresql server. I *thought* that all I would then have to do is change my mdb2 dsn to reflect the new driver to use and then find parts of my code that are not standard enough SQL - but when I try to use anything, I get - Fatal error: Call to undefined method MDB2_Error::execute() in /path/to/blah on line 63 I'm missing something here. Here's my dsn - $dsn = array( 'phptype' => 'pgsql', 'username' => 'webuser', 'password' => 'secret', 'hostspec' => 'localhost', 'database' => 'mydbname'); What am I doing wrong? I get the same error no matter what I set username/password/hostspec/database to - so I think it is a basic connection error. I'm hoping to be able to get the switch to postgresql finished soon so that I can start playing with using the PostGIS extension. I'm running php 5.2.12 (my own build, based on Fedora src.rpm) w/ pear 1.8.1: pear list Installed packages, channel pear.php.net: =========================================

Package           Version State
Archive_Tar       1.3.3   stable
Console_Getopt    1.2.3   stable
Date              1.4.7   stable
MDB2              2.4.1   stable

MDB2_Driver_mysql 1.4.1 stable MDB2_Driver_pgsql 1.4.1 stable

PEAR              1.8.1   stable

Structures_Graph 1.0.2 stable Text_Highlighter 0.7.1 beta

XML_Parser        1.3.2   stable
XML_RPC           1.5.1   stable
XML_Util          1.2.1   stable

Thanks for suggestions.