A [capybara](https://github.com/jnicklas/capybara) driver that uses [WebKit](http://webkit.org) via [QtWebKit](http://doc.qt.nokia.com/4.7/qtwebkit.html).
capybara-webkit depends on a WebKit implementation from Qt, a cross-platform development toolkit. You'll need to download the Qt libraries to build and install the gem.
[Download the non-debug Cocoa package](http://qt.nokia.com/downloads/qt-for-open-source-cpp-development-on-mac-os-x). Note that these binaries aren't compatible with OS X 10.7(Lion), so you'll need to install Qt via homebrew(can take more than an hour).
On Linux platforms, capybara-webkit requires an X server to run, although it doesn't create any visible windows. Xvfb works fine for this. You can setup Xvfb yourself and set a DISPLAY variable, or try out the [headless gem](https://github.com/leonid-shevtsov/headless).