Installation Problems: DBD::Pg

I'm trying to get the latest copy of Movable Type running against a Postgresql database. Postgresql is running, the database exists. I've updated tons of Perl things, but mt-check.cgi still refuses to acknowledge the existence of the Perl module:

$ cpan -D DBD::Pg
CPAN: Storable loaded ok (v2.20)
Going to read '/Users/jpl/Library/Application Support/.cpan/Metadata'
Database was generated on Mon, 15 Jun 2009 10:27:00 GMT
DBD::Pg
-------------------------------------------------------------------------
Postgres Driver for DBI
T/TU/TURNSTEP/DBD-Pg-2.13.1.tar.gz
/Library/Perl/5.8.8/darwin-thread-multi-2level/DBD/Pg.pm
Installed: 2.13.1
CPAN: 2.13.1 up to date
DBD::Pg Developers (DBDPG)
dbd-pg@perl.org

----------------------
System Information

Movable Type configuration file was not found.

Movable Type version: 4.26
Current working directory: /Library/WebServer/Sites/kat.showpage.org/cgi-bin/mt
MT home directory: /Library/WebServer/Sites/kat.showpage.org/cgi-bin/mt/
Operating system: darwin
Perl version: 5.8.8
Perl include path:
plugins/WXRImporter/lib
plugins/WidgetManager/lib
plugins/TypePadAntiSpam/lib
plugins/Textile/lib
plugins/StyleCatcher/lib
plugins/spamlookup/lib
plugins/MultiBlog/lib
/Library/WebServer/Sites/kat.showpage.org/cgi-bin/mt/extlib
/Library/WebServer/Sites/kat.showpage.org/cgi-bin/mt/extlib
/Library/WebServer/Sites/kat.showpage.org/cgi-bin/mt/lib
/Library/Perl/Updates/5.8.8/darwin-thread-multi-2level
/Library/Perl/Updates/5.8.8
/System/Library/Perl/5.8.8/darwin-thread-multi-2level
/System/Library/Perl/5.8.8
/Library/Perl/5.8.8/darwin-thread-multi-2level
/Library/Perl/5.8.8
/Library/Perl
/Network/Library/Perl/5.8.8/darwin-thread-multi-2level
/Network/Library/Perl/5.8.8
/Network/Library/Perl
/System/Library/Perl/Extras/5.8.8/darwin-thread-multi-2level
/System/Library/Perl/Extras/5.8.8
/Library/Perl/5.8.6
/Library/Perl/5.8.1
.
Web server: Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.7l DAV/2
(Probably) Running under cgiwrap or suexec

...

DBI (version >= 1.21)
Your server has DBI installed (version 1.609).

DBD::mysql
Your server does not have DBD::mysql installed, or DBD::mysql requires another module that is not installed. The DBD::mysql database driver is required to use MySQL Database. Please consult the installation instructions for help in installing DBD::mysql.

DBD::SQLite
Your server has DBD::SQLite installed (version 1.25).

DBD::Pg (version >= 1.32)
Either your server does not have DBD::Pg installed, the version that is installed is too old, or DBD::Pg requires another module that is not installed. The DBD::Pg database driver is required to use PostgreSQL Database. Please consult the installation instructions for help in installing DBD::Pg.

DBD::SQLite2
Your server has DBD::SQLite2 installed (version 0.33).

...

I have installed DBD::Pg. Then BUNDLE::DBD::Pg. Then Data::Storage::DBI::Postgres. Then ran cpan and did a full update. Then tried installing everything that remotely looked like DBD::Pg might require it. It took a while, but I found the Postgres

I run perl and type "use DBD::Pg" and it's happy. "use Data::Storage::DBI::Postgres" is also happy.

I'm not a Perl god. I'm not sure how to figure out what's missing.