GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
/* Nil or a symbol naming the window system under which emacs is
running ('x is the only current possibility) */
-extern Lisp_Object Vwindow_system;
+extern Lisp_Object Vinitial_window_system;
/* Version number of X windows: 10, 11 or nil. */