今晚朋友安装 rails，用 ruby.taobao.org 的源折腾半天也没有装上，提示缺少依赖 无奈下换官方源一次成功

然后检查 ruby.taobao.org 发现居然没有 rails 3.2.1, 最近版本只到 3.1.1

 gem install rails --version 3.2.1
Downloading http://ruby.taobao.org/specs.4.8.gz
File already downloaded and cached to /opt/App/ruby192/lib/ruby/gems/1.9.1/cache
ERROR:  Could not find a valid gem 'rails' (= 3.2.1) in any repository
Downloading http://ruby.taobao.org/latest_specs.4.8.gz
File already downloaded and cached to /opt/App/ruby192/lib/ruby/gems/1.9.1/cache
ERROR:  Possible alternatives: rails

@huacnlee