http://gemcasts.org/2008/07/21/gemcasts-8-ruby%E3%81%A8rubygems%E3%82%92windows%E3%81%AB%E5%85%A5%E3%82%8C%E3%81%A6%E3%81%BF%E3%82%88%E3%81%86
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I