some shells can set MAIL to be the mailbox of the user, and
environment variables will override assignments in make when using
conditional assignments.
LOWER_OPSYS for libtool use under BSD/OS.
Add initial support for using pkgsrc under BSD/OS. This was tested
under BSDI BSD/OS 4.3.1. (Thank you D. Hege.)
(Need to add BSDOS.x11.dist later.)
CVS ----------------------------------------------------------------------