I cannot install capybara-webkit 0.8.0. I installed QT and added C:\Qt\4.7.4\bin\ to my PATH. And anyway I'm getting this error: ERROR: Error installing capybara-webkit: ERROR: Failed to build gem native extension. C:/Ruby193/bin/ruby.exe extconf.rb Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/capybara- webkit-0.8.0 for inspection. Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/capybara-webkit-0.8.0/./ge m_make.out