Another problem with -> LoadError: no such file to load

[Csongor]

I am trying to install and use the file-tail gem, but it's just not
working.

This is the gem I'm trying to use: http://file-tail.rubyforge.org/doc/classes/File/Tail.html

And this is what happens:

=== Installing gem ===

csongors-mac:~ csgyuricza$ sudo gem install file-tail
Successfully installed file-tail-1.0.3
1 gem installed
Installing ri documentation for file-tail-1.0.3...
Installing RDoc documentation for file-tail-1.0.3...

=== Verifying gem path ===

csongors-mac:~ csgyuricza$ gem env
RubyGems Environment:
- RUBYGEMS VERSION: 1.1.1
- RUBY VERSION: 1.8.6 (2008-03-03 patchlevel 114) [i686-darwin9.2.2]
- INSTALLATION DIRECTORY: /opt/local/lib/ruby/gems/1.8
- RUBY EXECUTABLE: /opt/local/bin/ruby
- RUBYGEMS PLATFORMS:
- ruby
- x86-darwin-9
- GEM PATHS:
- /opt/local/lib/ruby/gems/1.8
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://gems.rubyforge.org

csongors-mac:~ csgyuricza$ ls -ltr /opt/local/lib/ruby/gems/1.8/gems/
total 0
drwxr-xr-x 6 root admin 204 May 13 18:08 progressbar-0.0.3
drwxr-xr-x 13 root admin 442 May 13 18:09 mysql-2.7
drwxr-xr-x 12 root admin 408 May 19 13:33 rake-0.8.1
drwxr-xr-x 5 root admin 170 May 19 13:33 activesupport-2.0.2
drwxr-xr-x 10 root admin 340 May 19 13:33 activerecord-2.0.2
drwxr-xr-x 10 root admin 340 May 19 13:33 actionpack-2.0.2
drwxr-xr-x 9 root admin 306 May 19 13:33 actionmailer-2.0.2
drwxr-xr-x 7 root admin 238 May 19 13:33 activeresource-2.0.2
drwxr-xr-x 16 root admin 544 May 19 13:33 rails-2.0.2
drwxr-xr-x 7 root admin 238 May 19 13:50 sqlite3-ruby-1.2.1
drwxr-xr-x 4 root admin 136 May 21 10:46 selenium-0.7
drwxr-xr-x 6 root admin 204 May 21 10:52 Selenium-1.0.9
drwxr-xr-x 12 root admin 408 May 27 09:58 file-tail-1.0.3 =====
GEM IS HERE

=== Trying to use gem ===

csongors-mac:~ csgyuricza$ irbLoadError: no such file to load -- file-tail
from /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `gem_original_require'
from /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `require'
from (irb):6
======

Any idea why this is happening?

Ruby and gems versions are:

csongors-mac:~ csgyuricza$ ruby -v
ruby 1.8.6 (2008-03-03 patchlevel 114) [i686-darwin9.2.2]
csongors-mac:~ csgyuricza$ gem -v
1.1.1