Add a new USE_LIBTOOL definition that uses the libtool package instead of
pkglibtool which is now considered outdated.
USE_PKGLIBTOOL is available for backwards compatibility with old packages
but is deprecated for new packages.
components. This allows users of Qt to specify QTDIR=/path/to/qt instead
of having to patch all configure scripts and makefiles to look for alternate
names. This is the recommended approach from Troll Tech (Qt authors).
update pkgs which use qt1 to reflect this.
citing pkg/DESCR:
Qwt is an extension to the Qt GUI library from Troll Tech AS.
The Qwt library contains widgets and components which are
primarily useful for technical and scientifical purposes.
It includes a 2-D plotting widget, different kinds of sliders,
and much more.
