根据的解释，lighthouse是和window system无关的，window system都是作为一个插件和lighthouse交互。
Lighthouse is a research project that aims to make it easier to port Qt to different graphics systems.
Conceptually it is “Qt for Embedded Linux without QWS”.
Lighthouse is completely windowsystem-agnostic: all interfacing with window systems is done in plugins.
相关链接：
http://gitorious.org/+qt-developers/qt/lighthouse#more
http://labs.qt.nokia.com/2010/02/10/a-lighthouse-with-windows/
http://qt.gitorious.org/qt/pages/GettingStartedWithLighthouse/