rubyzip not recognized in rails

First of all, Let me list my configurations:

  FreeBSD 8.0
  Ruby 1.9.1p376
  Rails 2.3.5
  rubyzip 0.9.4 installed in /usr/local/lib/ruby19/gems/1.9/gems/

I have placed the following line inside block

  cconfig.gem 'rubyzip', :lib => 'zip/zip'

However, I got a "no such file to load -- zip/zip" error while I have
placed a line in a controller file
  require 'zip/zip'.

Could somebody give me a hand? Thanks in advance!

There is a typo in initilizer. Also require 'rubygems` in your code before requiring zip/zip

Thanks for replying, Gintautas.

The typo was not in the environment.rb.

I did try to add "require 'rubygems' " before require 'zip/zip' but it
still doesn't work.
nor "require 'composite_primary_keys' " works.

It seems the gems installed is not recognized at all. :' (

Furthermore, I have tried to add
   ENV['GEM_PATH'] = '/usr/local/lib/ruby19/gems/1.9'
at the beginning of the environment.rb but still failed.