Re: Darwin support for lisp/battery.el.

[Richard M. Stallman]

The changes are ok (presuming they work), but there is a problem in
the comments:

    ! ;; There is at present support for Linux and Darwin.

Darwin is a complete operating system.  To include "Linux" in that
list implies that it too is a complete operating system.  That's
unfair to the GNU Project, so we won't say do that.

The current comment says "Linux" because it refers specifically to the
kernel and its version numbers.  (There are no generally meaningful
version numbers for the GNU/Linux system as a whole.)