[X11]The [X11] package contains all subroutines and functions that
produce graphical output on the screen. LUX uses the freely available
and free X11 library to produce graphical output. It is included
automatically if the X11 library is detected on your computer system,
unless you specify --without-x as an option to
./configure. If the [X11] package is not included, then
you can still generate graphical output, but only output to files.
See also: Installing LUX