error of "no such file to load -- ferret_ext"

I've installed the latest version of Ferret (0.10.13) on Mac OS X 10.4.8
(Tiger) and I'm developing using Locomotive2. I installed with:
$ gem install ferret

I have a ferret_test.rb file:
----begin---------
require 'rubygems'
require 'ferret'
include Ferret
index = Index::Index.new(:path => '/opt/search-index')
----end-----------

I get an error when I run the test:
$ ruby test/ferret_test.rb
/Applications/Locomotive2/Bundles/rmagickRailsSept2006_ppc.locobundle/framework/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require': no such file to load -- ferret_ext (LoadError)
        from
/Applications/Locomotive2/Bundles/rmagickRailsSept2006_ppc.locobundle/framework/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
        from
/Applications/Locomotive2/Bundles/rmagickRailsSept2006_ppc.locobundle/framework/lib/ruby/gems/1.8/gems/ferret-0.10.13/lib/ferret.rb:25
        from
/Applications/Locomotive2/Bundles/rmagickRailsSept2006_ppc.locobundle/framework/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:33:in
`require'
        from test/ferret_test.rb:2

How do I resolve this issue? What is "ferret_ext" and why isn't it here
after the gem install?

I've searched the forum and googled without finding more info.

-- Daniel
kehoe-u2F8/sPSwBdWk0Htik3J/w@xxxxxxxxxxxxxxxx

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