我有一个使用 macports 设置的 rails 环境。我最近更新了 macports，它似乎有断轨的副作用。当我尝试启动 rails 服务器时，我得到：
$ ./script/server
=> Booting WEBrick
=> Rails 2.3.5 application starting on http://0.0.0.0:3000
/opt/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. Use #requirement
!!! The bundled mysql.rb driver has been removed from Rails 2.2. Please install the mysql gem and try again: gem install mysql.
/opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin9/mysql.bundle: dlopen(/opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin9/mysql.bundle, 9): Library not loaded: /opt/local/lib/mysql5/mysql/libmysqlclient.15.dylib (LoadError)
Referenced from: /opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin9/mysql.bundle
Reason: image not found - /opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin9/mysql.bundle
我已经尝试使用我在网上找到的各种配置多次重新安装 mysql gem，但似乎没有任何帮助。此外，当我尝试使用 rake 时，我得到：
rake db:migrate
Rails requires RubyGems >= 1.3.1 (you have 1.0.1). Please宝石更新--系统and try again.
虽然：
gem --version
1.3.6
这里发生了什么？