no such file to load -- omniauth-openid (LoadError)

[conradwt]

When deploying to production, I'm seeing the following message within the Unicorn log file, unicorn.log:

shared/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `require': no such file to load -- omniauth-openid (LoadError)

Next, my Gemfile has the omniauth specific details:

gem "omniauth-facebook",         "~> 1.2.0"
gem "omniauth-openid",            :git => 'git://github.com/intridea/omniauth-openid.git'
gem "omniauth-twitter",              "~> 0.0.11"

Next, my initializer looks like the following:

config/initializers/omniauth.rb:

require 'omniauth-openid'
require 'openid/store/filesystem'

Rails.application.config.middleware.use OmniAuth::Builder do  

  provider :facebook, FACEBOOK_ID,     FACEBOOK_SECRET
  provider :twitter,  TWITTER_ID,  TWITTER_SECRET
  provider :open_id, :name => 'google', :identifier => 'https://www.google.com/accounts/o8/id'
  provider :open_id, :name => 'yahoo',  :identifier => 'yahoo.com'

end