Edit: This answer is outdated, but can't be removed because it's accepted. Please see the solution from Stacey Richards for the correct answer.
sudo apt-get install php5-cli php5-dev make
sudo apt-get install libsqlite3-0 libsqlite3-dev
sudo apt-get install php5-sqlite3
sudo apt-get remove php5-sqlite3
cd ~
wget http://pecl.php.net/get/sqlite3-0.6.tgz
tar -zxf sqlite3-0.6.tgz
cd sqlite3-0.6/
sudo phpize
sudo ./configure
sudo make
sudo make install
sudo apache2ctl restart
Ripped from the ubuntu form.
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