Could not find gem 'gbarcode (>= 0) ruby' in http://ift.tt/1PaPwGq (at ruby1.9)

I am using ubuntu 14.04 and trying to configure my existing rails application, i am getting this error when i try to bundle install

Could not find gem 'gbarcode (>= 0) ruby' in http://ift.tt/1PaPwGq (at ruby1.9).
Source does not contain any versions of 'gbarcode (>= 0) ruby'

below is the code in my Gemfile.

gem 'gbarcode', :git => 'http://ift.tt/1PaPwGq', :branch => 'ruby1.9'

I am not sure what i am doing wrong, can anyone suggest, thanks.