Vagrant.configure("2") do |config|
  config.vm.box = "<%= box_name %>"
  <% if box_version -%>
  config.vm.box_version = "<%= box_version %>"
  <% end -%>
  <% if box_url -%>
  config.vm.box_url = "<%= box_url %>"
  <% end -%>
end