なるほど、併用か。

>>968

$ gem dependency rails
Gem rails-2.0.2
rake (>= 0.7.2)
activesupport (= 2.0.2)
activerecord (= 2.0.2)
actionpack (= 2.0.2)
actionmailer (= 2.0.2)
activeresource (= 2.0.2)