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POCan't find gems in irb: "NameError: uninitialized constant Gem from (irb)"
 

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    <p>When I run a Rails app it finds all of my installed gems correctly.</p> <p>This is the first time I tried to call some gems from inside irb and it couldn't find them.</p> <pre><code>blocke:~$ irb irb(main):001:0&gt; require 'rubygems' =&gt; true irb(main):002:0&gt; require 'rails' LoadError: no such file to load -- rails from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' from (irb):2 irb(main):003:0&gt; </code></pre> <p>When I run "gem environment" this is what I get:</p> <pre><code>blocke:~$ gem environment RubyGems Environment: - RUBYGEMS VERSION: 1.3.5 - RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [i486-linux] - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8 - RUBY EXECUTABLE: /usr/bin/ruby1.8 - EXECUTABLE DIRECTORY: /usr/bin - RUBYGEMS PLATFORMS: - ruby - x86-linux - GEM PATHS: - /usr/lib/ruby/gems/1.8 - /home/blocke/.gem/ruby/1.8 - GEM CONFIGURATION: - :update_sources =&gt; true - :verbose =&gt; true - :benchmark =&gt; false - :backtrace =&gt; false - :bulk_threshold =&gt; 1000 - "gem" =&gt; "--no-ri --no-rdoc" - :sources =&gt; ["http://gemcutter.org", "http://gems.rubyforge.org/", "http://gems.github.com"] - REMOTE SOURCES: - http://gemcutter.org - http://gems.rubyforge.org/ - http://gems.github.com </code></pre> <p>According to irb, the gem path is the same except in the reverse order:</p> <pre><code>blocke:~$ irb irb(main):001:0&gt; require 'rubygems' =&gt; true irb(main):002:0&gt; Gem.path =&gt; ["/home/blocke/.gem/ruby/1.8", "/usr/lib/ruby/gems/1.8"] </code></pre>
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