;; Contents of the (gnu make) Guile module
-;; Copyright (C) 2011-2020 Free Software Foundation, Inc.
+;; Copyright (C) 2011-2022 Free Software Foundation, Inc.
;; This file is part of GNU Make.
;;
;; GNU Make is free software; you can redistribute it and/or modify it under
;; details.
;;
;; You should have received a copy of the GNU General Public License along
-;; with this program. If not, see <http://www.gnu.org/licenses/>.
+;; with this program. If not, see <https://www.gnu.org/licenses/>.
(define (to-string-maybe x)
(cond