phpBB help - Timezonedb.so?

Hey guys,

I am in the process of installing phpBB3 on my website, but I have encountered an error.
[18-Mar-2012 12:23:55 UTC] PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/timezonedb.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/timezonedb.so: cannot open shared object file: No such file or directory in Unknown on line 0

I have access to cPanel and WHM, and have downloaded timezonedb-2012.2.tgz, but no idea what to do with it. Through FTP, I am unable to find the /usr directory either.

Any ideas?