daniel@Daniel-Server:~/Arbeitsfläche/Haussteuerung$ ruby hello_world.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mysql2 (LoadError)
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from hello_world.rb:2:in `<main>'
daniel@Daniel-Server:~/Arbeitsfläche/Haussteuerung$