If you're looking for stable source you probably will be satisfied by grabbing a release tarball from <a href="http://ftp.x.org/pub/X11R7.1/">http://ftp.x.org/pub/X11R7.1/</a><br><br>see the <a href="http://wiki.x.org/wiki/ModularDevelopersGuide">
developers guide</a> perhaps<br>