SQLite as a PHP extension on Linux

[bsnipes]

I am trying to get SQLite running with PHP 4.3.2 on Gentoo Linux . In my searches I have come across the following instructions to get it working:

emerge SQLite
pear install SQLite

modify the php.ini file and add:
extension=sqlite.so

I have a few problems with this:
1. Nowhere on my harddrive does sqlite.so (not even in the /usr/lib/php/extensions dir)
2. The only files added to the pear directory (/usr/lib/php) are in the test and doc directories. I expected either a new top-level dir or something under the DB directory.

Can anyone shed some light on how to get the sqlite.so file onto mys system? I don't want to upgrade the beta version of PHP 5 yet.

Thanks,
Brian