output.txt

Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /home/arne/.rubies/jruby-1.7.3/lib/native/i386-Linux/libjffi-1.2.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
WARN: The Shoes.setup method is no longer used, you need to install gems yourself.
WARN: To use the 'bluecloth' gem, install it with 'gem install bluecloth --version '=2.0.6'', and put 'require "bluecloth"' at the top of your Shoes program.
WARN: To use the 'metaid' gem, install it with 'gem install metaid ', and put 'require "metaid"' at the top of your Shoes program.
LoadError: no such file to load -- bluecloth
      require at org/jruby/RubyKernel.java:1027
      require at /home/arne/.rubies/jruby-1.7.3/lib/ruby/shared/rubygems/custom_require.rb:55
       (root) at /home/arne/.shoes/red_shoes/dist/samples/simple-rubygems.rb:10
         load at org/jruby/RubyKernel.java:1046
       (root) at /home/arne/.shoes/shoes4/lib/shoes/cli.rb:1
  execute_app at /home/arne/.shoes/shoes4/lib/shoes/cli.rb:73
       (root) at -e:1

setup.rb

module Shoes
  class <<self

    # To ease the upgrade path from Shoes 3 we warn users they need to install
    # and require gems themselves.
    #
    # @example
    #   Shoes.setup do
    #     gem 'bluecloth =2.0.6'
    #     gem 'metaid'
    #   end
    #
    # @param block [Proc] The block that describes the gems that are needed
    # @deprecated
    def setup(&block)
      $stderr.puts "WARN: The Shoes.setup method is no longer used, you need to install gems yourself."
      Class.new do
        def gem(name)
          name, version = name.split()
          install_cmd = ["gem install", name, version ? "--version '#{version}'" : ''].join(' ')
          $stderr.puts "WARN: To use the '#{name}' gem, install it with '#{install_cmd}', and put 'require \"#{name}\"' at the top of your Shoes program."
        end
      end.new.instance_eval(&block)
    end

  end
end

I personally would skip the version stuff due to imo unnecessary work.

And I'd actually name that class, that does the gems stuff. Just because I don't like unnamed classes and I personally think that the end.new.instance_eval is a bit to complex and confusing.

Thanks buddy!