Prebuilt Packages on Ubuntu 12.04

To install prebuilt packages for Ubuntu 12.04 (amd64):

sudo apt-get install software-properties-common python-software-properties
sudo add-apt-repository ppa:mapnik/boost
wget -O - http://dl.hhvm.com/conf/hhvm.gpg.key | sudo apt-key add -
echo deb http://dl.hhvm.com/ubuntu precise main | sudo tee /etc/apt/sources.list.d/hhvm.list
sudo apt-get update
sudo apt-get install hhvm