Undefined subroutine DBD::Pg::db::_login called

RT Users
1

RT 2.0.4, PostgreSQL 7.1.2, mod_perl 1.26, Apache 1.3.20, DBI 1.18,
DBD-Pg 1.01

Everything built and installed (with tests) with no remaining errors.

I access http://ourhost.mitre.org/WebRT/html/ and I get an
Internal Server Error.