I compiled my own X11 Server for Mac OS X and want it to replace the original outdated X11.app supplied by Lion. How do I do that?
- cd to /usr/X11/bin
- rename the existing X symlink to Xquartz (to X_orig for example) in case you need to revert in the future to the "vanilla" config
- symlink X to your compiled binary.
The XQuartz install docs have an alternate approach for installing their X11 binary. They use launchctl and set the DISPLAY to point to the socket for their server. I believe the program it runs (launchd_startx) listens on the socket and starts the X server when a connection is made. The nice thing about this approach is it leaves the original X11.app unmodified.