This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.
Qt 4.4 introduces many new features as well as many improvements and
bugfixes over the 4.3.x series. For more details, see the online
documentation which is included in this distribution. The
documentation is also available at http://doc.trolltech.com/4.4
The Qt version 4.4 series is binary compatible with the 4.3.x series.
A long list of changes can be found in the changes-4.4.0 file in the
distribution.
Update OKed (and initial work provided) by adam@..
