org-clock-x11idle-program-name

org-clock-x11idle-program-name is a variable defined in `org-clock.el'.
Its value is

"x11idle"

Documentation:
Name of the program which prints X11 idle time in milliseconds.

You can find x11idle.c in the contrib/scripts directory of the
Org git distribution. Or, you can do:

sudo apt-get install xprintidle

if you are using Debian.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.