MRuby::GemBox.new do |conf|
  conf.gem :core => "mruby-sprintf"
  conf.gem :core => "mruby-print"

  Dir.glob("#{root}/mrbgems/mruby-*") do |x|
    g = File.basename(x)
    conf.gem :core => g unless g =~ /^mruby-(print|sprintf)$/
  end
end