asami d52813b873 (1) Change comment for USE_X11 to be more explicit about what it
means.

(2) Change MASTER_SITE_GNU etc. to use += instead of ?=, so users can
    specify a local mirror in /etc/make.conf and still get the full
    fallback in case something is missing.
Submitted by:	Narvi <narvi@haldjas.folklore.ee>

(3) Skip port if USE_X11 or USE_IMAKE is defined and /usr/X11R6
    doesn't exist.
Submitted by:	imp

(4) Add "-" in front of rmdir of ${DISTDIR}/${DIST_SUBDIR} in
    distclean target; the directory might not be empty because the
    subdir is shared with some other ports' distfiles.
1997-04-15 08:36:41 +00:00
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