The X11 integration is really bad. Now that they don't bundle it along with the default installation (XQuartz instead, that you must fetch yourself), how can I

The X11 integration is really bad. Now that they don't bundle it along with the default installation (XQuartz instead, that you must fetch yourself), how can I run xclock after installing OSX? In truth, the lack of cmd-tabbing support to X11 apps is irritating, as is the menus on the windows being in the wrong place. I can see why they didn't fully support it though - X11 just doesn't fit in with their Quartz system. If you turn on Quartz Debugging and do things like "show tracking rectangles" X11 windows are a complete unknown to Quartz.