Vagrantfile.rb

# -*- mode: ruby -*-

$build_nokogiri = <<SCRIPT
apt-get update
apt-get -y install docker.io
apt-get -y install bundler
gem install rake-compiler-dock

cd
git clone https://github.com/larskanis/nokogiri
cd nokogiri
git checkout make-use-of-rake-compiler-dock
bundle
rake gem:windows
cp /root/nokogiri/pkg/*.gem /vagrant
SCRIPT

Vagrant.configure(2) do |config|
  config.vm.box = "ubuntu/trusty64"

  config.vm.provision "shell", inline: $build_nokogiri
end