Rail bundle error - capybara-webkit - Failed to create custom extension

Question

trying to run the package (existing application, new computer with Ubuntu 12.04).

Installing capybara-webkit (0.12.1) with native extensions Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /home/durrantm/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb Gem files will remain installed in /home/durrantm/.rvm/gems/ ruby-1.9.3-p194@dmstaffing /gems/capybara-webkit-0.12.1 for inspection. Results logged to /home/durrantm/.rvm/gems/ ruby-1.9.3-p194@dmstaffing /gems/capybara-webkit-0.12.1/./gem_make.out An error occurred while installing capybara-webkit (0.12.1), and Bundler cannot continue. Make sure that `gem install capybara-webkit -v '0.12.1'` succeeds before bundling. 

Answer 1

The answer was "qt" -:

 sudo apt-get install libqt4-dev libqtwebkit-dev