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Description of problem:
On line 18, the file /usr/lib/ruby/1.8/rdoc/parsers/parse_rb.rb
references "irb/slex", which is not contained in the ruby-libs RPM.
When installing Ruby 1.8.2 from the source, this file is present in
/usr/local/lib/ruby/1.8/irb/slex.rb.


Version-Release number of selected component (if applicable):
ruby-libs-1.8.2-1.FC3.0

How reproducible:
Always

Steps to Reproduce:
1. up2date ruby

2. Download and install rubygems 0.8.1 from the source.

3. Run "gem install rails"


Actual Results: 
/usr/lib/site_ruby/1.8/rubygems/loadpath_manager.rb:5:in `require__':
No such file to load -- irb/slex (LoadError)
        from /usr/lib/site_ruby/1.8/rubygems/loadpath_manager.rb:5:in
`require'
        from /usr/lib/ruby/1.8/rdoc/parsers/parse_rb.rb:18
        from /usr/lib/site_ruby/1.8/rubygems/loadpath_manager.rb:5:in
`require__'
        from /usr/lib/site_ruby/1.8/rubygems/loadpath_manager.rb:5:in
`require'
        from /usr/lib/ruby/1.8/rdoc/rdoc.rb:8
        from /usr/lib/site_ruby/1.8/rubygems/loadpath_manager.rb:5:in
`require__'
        from /usr/lib/site_ruby/1.8/rubygems/loadpath_manager.rb:5:in
`require'
        from /usr/lib/site_ruby/1.8/rubygems/doc_manager.rb:42:in
`generate_rdoc'
        from /usr/lib/site_ruby/1.8/rubygems/gem_commands.rb:167:in
`execute'
        from /usr/lib/site_ruby/1.8/rubygems/gem_commands.rb:166:in `each'
        from /usr/lib/site_ruby/1.8/rubygems/gem_commands.rb:166:in
`execute'
        from /usr/lib/site_ruby/1.8/rubygems/command.rb:49:in `invoke'
        from /usr/lib/site_ruby/1.8/rubygems/cmd_manager.rb:90:in
`process_args'        from
/usr/lib/site_ruby/1.8/rubygems/cmd_manager.rb:63:in `run'
        from /usr/lib/site_ruby/1.8/rubygems/gem_runner.rb:9:in `run'
        from /usr/bin/gem:11


Additional info: