Variable: window-system-version

window-system-version is a variable defined in dispnew.c.

This variable is obsolete since 24.3; it does not give useful information.

Value

nil

Documentation

The version number of the window system in use.

For X windows, this is 11.

Probably introduced at or before Emacs version 18.52.

Source Code

// Defined in /usr/src/emacs/src/dispnew.c
  DEFVAR_LISP ("window-system-version", Vwindow_system_version,
	       doc: /* The version number of the window system in use.
For X windows, this is 11.  */);