title: "LoadError: no such file to load" when requiring gem
body: <p>I'm using RVM, Ruby 1.9.2 and Rails 3.0.3 installed. I installed the curb-fu gem just now. When I do <code>gem list</code>, curb-fu is listed. When I do <code>require 'curb-fu'</code> in the <code>irb</code>, it returns <code>true</code>.</p>
  
  <p>But when I try the same in the rails console of my app, I get this error:</p>
  
  <pre><code>ruby-1.9.2-p136 :001 &gt; require 'curb-fu'
  LoadError: no such file to load -- curb-fu
  </code></pre>
  
  <p>When I do <code>require 'rubygems'</code>, it returns <code>nil</code>, and when I try curb-fu after that it gives the same error.</p>
  
  <p>My gem environment:</p>
  
  <pre><code>RubyGems Environment:
    - RUBYGEMS VERSION: 1.3.7
    - RUBY VERSION: 1.9.2 (2010-12-25 patchlevel 136) [x86_64-darwin10.5.0]
    - INSTALLATION DIRECTORY: /Users/rits/.rvm/gems/ruby-1.9.2-p136
    - RUBY EXECUTABLE: /Users/rits/.rvm/rubies/ruby-1.9.2-p136/bin/ruby
    - EXECUTABLE DIRECTORY: /Users/rits/.rvm/gems/ruby-1.9.2-p136/bin
    - RUBYGEMS PLATFORMS:
      - ruby
      - x86_64-darwin-10
    - GEM PATHS:
       - /Users/rits/.rvm/gems/ruby-1.9.2-p136
       - /Users/rits/.rvm/gems/ruby-1.9.2-p136@global
    - GEM CONFIGURATION:
       - :update_sources =&gt; true
       - :verbose =&gt; true
       - :benchmark =&gt; false
       - :backtrace =&gt; false
       - :bulk_threshold =&gt; 1000
    - REMOTE SOURCES:
       - http://rubygems.org/
  </code></pre>
  
  <p>What can I do?</p>