davical upgrade problem

[n dhert]

I have php52-5.2.13_2 (not php5-5.3.2, too many people had stuff only
compatible with the 5.2 version)

There was an upgrade of davical, but I get
--->  Upgrade of www/davical started at: Tue, 08 Jun 2010 06:48:38 +0200
--->  Upgrading 'davical-0.9.8.4' to 'davical-0.9.9' (www/davical)
--->  Build of www/davical started at: Tue, 08 Jun 2010 06:48:38 +0200
--->  Building '/usr/ports/www/davical'
===>  Cleaning for davical-0.9.9
Unknown extension pdo_pgsql for PHP 52.
*** Error code 1
Stop in /usr/ports/www/davical.
** Command failed [exit code 1]: /usr/bin/script -qa
/tmp/portupgrade20100608-92
883-p9aga4-0 env UPGRADE_TOOL=portupgrade UPGRADE_PORT=davical-0.9.8.4
UPGRADE_P
ORT_VER=0.9.8.4 make FETCH_BEFORE_ARGS=-q DEPENDS_TARGET=package
** Fix the problem and try again.
but I have on my system:
# pkg_info | grep pdo_
php52-pdo_mysql-5.2.13_2 The pdo_mysql shared extension for php
php52-pdo_pgsql-5.2.13_2 The pdo_pgsql shared extension for php
php52-pdo_sqlite-5.2.13_2 The pdo_sqlite shared extension for php

What's wrong, how to solve?