p4raw-id: //depot/perl@11881
on Unix, ':' on MacPerl, etc...) we recommend you use the File::Spec
modules wherever portability is a concern.
-=begin _private
-
=item *
Actually, on Mac OS, the C<getcwd()>, C<fastgetcwd()> and C<fastcwd()>
calls `pwd`. Likewise, the C<abs_path()> function is an alias for
C<fast_abs_path()>.
-=end _private
-
=back
=head1 SEE ALSO