安装声明性授权将安装rails 3的依赖项

声明性授权gem的0.4.1版将rails>=2.1.0作为依赖项。如果您先安装rails 2.3.5,然后安装声明性授权的0.4.1,您将获得rails 3的依赖项。如果声明式_授权需要rails>=2.1.0,如果安装了2.3.5,则应该满足该依赖关系,对吗?是什么原因导致安装了所有其他gems?这是rubygems病毒吗?

$ ruby -v
ruby 1.8.7 (2010-04-19 patchlevel 253) [i686-darwin10.4.0], MBARI 0x6770, Ruby Enterprise Edition 2010.02

$ gem -v
1.3.7

$ gem install rails -v 2.3.5
Successfully installed rake-0.8.7
Successfully installed activesupport-2.3.5
Successfully installed activerecord-2.3.5
Successfully installed rack-1.0.1
Successfully installed actionpack-2.3.5
Successfully installed actionmailer-2.3.5
Successfully installed activeresource-2.3.5
Successfully installed rails-2.3.5
8 gems installed

$ gem install declarative_authorization -v 0.4.1
Successfully installed declarative_authorization-0.4.1
Successfully installed activesupport-3.0.3
Successfully installed builder-2.1.2
Successfully installed i18n-0.4.2
Successfully installed activemodel-3.0.3
Successfully installed rack-1.2.1
Successfully installed rack-test-0.5.6
Successfully installed rack-mount-0.6.13
Successfully installed tzinfo-0.3.23
Successfully installed abstract-1.0.0
Successfully installed erubis-2.6.6
Successfully installed actionpack-3.0.3
Successfully installed arel-2.0.4
Successfully installed activerecord-3.0.3
Successfully installed activeresource-3.0.3
Successfully installed mime-types-1.16
Successfully installed polyglot-0.3.1
Successfully installed treetop-1.4.9
Successfully installed mail-2.2.10
Successfully installed actionmailer-3.0.3
Successfully installed thor-0.14.4
Successfully installed railties-3.0.3
Successfully installed bundler-1.0.7
23 gems installed

$ gem dependency declarative_authorization
Gem declarative_authorization-0.4.1
  rails (>= 2.1.0, runtime)