under NetBSD-current without actually needing ncursesw.
+ Only make "wide-curses" an available option on platforms that have the
necessary wide-character support. It turns out NetBSD-3.x is not one
of them.
+ Use a less patchy way to turn -ldb into -ldb3 by letting the wrappers
do it.
+ Add full DESTDIR support.
Bump the PKGREVISION to 6.