title: Why can't Ruby find Rake?
body: <p>I was using the Rails 3 beta gem yesterday but went back to 2.3.8, and, after cleaning the system gems, I was trying to run a simple Rake task and got this:</p>
  
  <pre>
  Peleliu:haml jayfallon$ sudo rake install
  /Library/Ruby/Site/1.8/rubygems.rb:779:in `report_activate_error': Could not find RubyGem rake (>= 0) (Gem::LoadError)
   from /Library/Ruby/Site/1.8/rubygems.rb:214:in `activate'
   from /Library/Ruby/Site/1.8/rubygems.rb:1082:in `gem'
   from /usr/bin/rake:18
  </pre>
  
  <p>I am not sure if it has to do with my path being borked or not.</p>
  
  <pre>
  RubyGems Environment:
    - RUBYGEMS VERSION: 1.3.7
  
    - RUBY VERSION: 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10.0.0]
    - INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/1.8
    - RUBY EXECUTABLE: /usr/local/bin/ruby
    - EXECUTABLE DIRECTORY: /usr/local/bin
    - RUBYGEMS PLATFORMS:
      - ruby
      - x86-darwin-10
    - GEM PATHS:
       - /usr/local/lib/ruby/gems/1.8
       - /Users/jayfallon/.gem/ruby/1.8
    - GEM CONFIGURATION:
       - :update_sources => true
       - :verbose => true
       - :benchmark => false
       - :backtrace => false
       - :bulk_threshold => 1000
       - :sources => ["http://gems.rubyforge.org/", "http://gems.github.com", "http://gems.github.com", "http://gems.github.com", "http://gems.github.com", "http://gems.github.com", "http://gems.github.com", "http://gems.github.com", "http://gems.github.com", "http://gems.github.com", "http://gemcutter.org/"]
    - REMOTE SOURCES:
  
       - http://gemcutter.org/
  </pre>