* lisp/w32-fns.el (w32-version, w32-read-registry): Declare these
functions to avoid byte compilation warnings. The functions
should be loaded when `w32--os-description' is called, as far as I
can tell.
;;;; System name and version for emacsbug.el
-(defun w32--os-description ()
+(declare-function w32-version "w32-win" ())
+(declare-function w32-read-registry "w32fns" (root key name))
+
+(defun w32--os-descriptiono ()
"Return a string describing the underlying OS and its version."
(let* ((w32ver (car (w32-version)))
(w9x-p (< w32ver 5))