source :rubygems
<%- includes(:gemfile_prelude,'') do |prelude| -%>

<%= prelude %>
<%- end -%>

gemspec

<%- includes(:gemfile,'') do |gemfile| -%>
<%= gemfile %>

<%- end -%>
group :development do
  gem 'rake',     '~> 0.8.7'
<%= includes :gemfile_development, '' -%>
end