MacBook-Air:iso_country_codes USERNAME$ ruby testcountry.rb
/Users/USERNAME/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- iso_country_codes (LoadError)
	from /Users/USERNAME/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from testcountry.rb:4:in `<main>'