gem 安装rail时候遇到的问题

我用gem 安装rail 发现一直连接不上 ，结果上网查了下 明白了 

ERROR:  While executing gem ... (Gem::DependencyError)  

 (2013-08-14 18:23:00)

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分类： rails

ERROR:  While executing gem ... (Gem::DependencyError)
    Unable to resolve dependencies: railties requires rack-ssl (~> 1.3.2), thor (< 2.0, >= 0.14.6); mail requires mime-types (~> 1.16), treetop (~> 1.4.8); sprockets requires hike (~> 1.2), tilt (!= 1.3.0, ~> 1.1)


add taobao source
gem sources --remove http://rubygems.org/         

gem source -a http://ruby.taobao.org/

gem install rails --no-ri --no-rdoc -v=3.2.7