Problem using gem under Windows XP/Vista

[Mitko Kostov]

Hi, guys.
Just playing with Shoes and twitter gem, but I never get working app 
under Windows ( XP/Vista with latest updates ).
[Shoes.setup do
 gem 'twitter'
end
require 'twitter']
It keeps saying "Building native extensions. This could take a while".
It works under Mac OS X 10.5.4, but not under Windows.
Ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
RubyGems 1.3.0
Shoes : 1057.

Thanks,
Mitko Kostov.