${PORTSDIR}. This undoes the changes done in rev. 1.38 and 1.59
(part of the bsd.port.mk pre-dawn ages I've never understood).
Requested by: jkh
(2) Add new variable NO_IGNORE that will override any IGNORE causes.
This is just a little hack to allow building of REQUIRES_MOTIF
ports and its dependencies only etc., so don't document it.
(3) Update +REQUIRED_BY files as necessary. Now you should be able to
delete ports that have runtime dependencies without pkg_delete
complaining about this file missing.