Can't get curb-fu Ruby gem to load properly

I'm stumped on a problem that others on SO and around the web have been having, but whose answers don't seem to be working for me.

Trying to use the curb-fu gem, which a wrapper around the curb gem. Here's what I've tried:

• gem list shows that curb and curb-fu are installed
• i've added: gem 'curb' and gem 'curb-fu' to my Gemfile and run bundle install
• i've uninstalled the gem files and tried restarting
• i've uninstalled libcurl3, libcurl3-gnutls, and libcurl4-openssl-dev
• load up a rails console, require curb-fu, and i can create an instance of CurbFu
• load up irb, require curb-fu, and i can create an instance of CurbFu

In my app, at the top of my file, I:

require 'rubygems'
require 'curb-fu'

And I get: no such file to load -- curb-fu

What the heck am I doing wrong? The only thing I can think of is that curb-fu has a dependency on curb, which, according to it's github page, has only been tested on GNU/Linux x86. I'm running Ubuntu Linux x86-64. I doubt that's it, but just wanted to bring it up.

Any ideas?

Update: I ran:

sudo find / -name "rubygems" -print

and the output was:

/root/rubygems-1.7.2/test/rubygems
/root/rubygems-1.7.2/test/rubygems/rubygems
/root/rubygems-1.7.2/lib/rubygems
/usr/share/doc/rubygems
/usr/local/lib/site_ruby/1.8/rubygems
/usr/lib/ruby/1.8/rubygems

Could that be the issue?

Update 2 Based off of this SO question I checked 'Gem.path' and 'gem env' and they're both pointing to the same place:

irb(main):003:0> Gem.path
=> ["/home/kf/.gem/ruby/1.8", "/usr/lib/ruby/gems/1.8"]

gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.7.2
  - RUBY VERSION: 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]
  - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8
  - RUBY EXECUT开发者_开发知识库ABLE: /usr/bin/ruby1.8
  - EXECUTABLE DIRECTORY: /usr/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /usr/lib/ruby/gems/1.8
     - /home/kf/.gem/ruby/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

Restarted the server, and everything works. Only other thing I tried before that was updating my path to include my main gem path, /usr/lib/ruby/gems/1.8. This solution feels awful, but hey, I'm up and running.