It is recommended that you start the configuration process by going to the
xc/config/cf directory, and copying the file xf86site.def
to host.def. Then read through the host.def file
(which is heavily commented), and set any parameters that you want for
your configuration. You can usually find out what the default settings
are by checking the .cf file(s) relevant to your OS.
Unlike previous versions, imake can now automatically detect and set the various OS*Version parameters, so you shouldn't need to enter those settings explicitly.
If you are using just the X421src-1.tgz part of the
source dist, you will need to define BuildFonts to
NO.