Rails - May 2010 - ruby-recaptcha seems be broken or has significant limitation

I''ve installed the ruby-recaptcha gem as instructed here:

http://bitbucket.org/mml/ruby-recaptcha/wiki/Home

Here are the steps that I''ve comleted:

1. installed the gem
2. added config.gem ''ruby-recaptcha'' environment.rb:
4.  modified action_controller.rb

class ApplicationController < ActionController::Base
include ReCaptcha::AppHelper

5.  modified application_helper.rb like so:

module ApplicationHelper
   include ReCaptcha::ViewHelper


The inclusion of the Recaptcha::ViewHelper works.  Meaning this tag:

 <%= get_captcha(:options => {:theme => ''clean''})
%>

Renders an image.

However, the controllers are another can of worms:

calls like:

 if validate_recap(params, @user.errors) && @user.save

fail with the following message:

NoMethodError (undefined method `validate_recap'' for
#<ActionView::Base:0x734b578>):

Which tells me that the module is not being mixed into application
controller and not then not inherited.

Does anybody have any ideas?  Is ruby-recaptcha a reputable product?
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