If you'd rather not install Node.

Vagrantfile.rb

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  config.vm.box = "precise64"

  config.vm.provision(:shell, :inline => <<-CMD)
    # exit on error
    set -e

    echo "Installing node and deps ..."
    if ! which node; then
      apt-get install -y build-essential
      apt-get install -y python-software-properties
      add-apt-repository ppa:chris-lea/node.js
      apt-get update
      apt-get install -y nodejs
    fi
  CMD
end