9.1.1. Manually Installing X11
If you want to install the XFree86 distribution manually, download
the distribution (see the instructions on the XFree86 web site) and
run the Xinstall.sh script to install the
XFree86 suite.
This script will prompt you for some configuration details, although
it includes defaults that should work for most Mac OS X users. The
XFree86 web site has an extensive set of instructions explaining how
to install XFree86 for the first time, how to install the suite over
an older XFree86 installation, and how to uninstall XFree86. There
are specific instructions for Mac OS X and Darwin.