trouble getting PDO going on ubuntu 6.06 installation

I am trying to get PDO going on a new desktop with Ubuntu 6.06. I have installed php5, php5-dev, etc and have php5 working with no problems. I then did a pecl install pdo and that installed ok. When I run phpinfo() I get that PDO is activated and the drivers has no value. I am now trying to install pdo_mysql and getting the following: checking for PDO includes... checking for PDO includes... /usr/include/php/ext configure: error: You've configured extension pdo_mysql, which depends on extension pdo, but you've either not enabled pdo, or have disabled it. ERROR: `/tmp/tmptDnQ5L/PDO_MYSQL-1.0.2/configure' failed When I list the contents of /usr/include/php/ext I get: ls /usr/include/php/ext/pdo php_pdo_driver.h php_pdo.h Any ideas as to where i need to go from here? Thanks for the help. Rick