MacBook-Air-K:myapp uzytkownik$ ruby test.rb
/Users/uzytkownik/.rvm/rubies/ruby-2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- gosu (LoadError)
	from /Users/uzytkownik/.rvm/rubies/ruby-2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:45:in `require'
	from test.rb:2:in `<main>'
MacBook-Air-K:myapp uzytkownik$