Log message:
always use the system's timezone files (previously it did so
only on Linux) -- the bundled ones are not consistent wrt
some prefix (freeassociation.sourceforge.net vs citadel.org)
which triggers a runtime check when imported ical files are used,
bump PKGREVISION

Log message:
Simply and speed up buildlink3.mk files and processing.
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.

Log message:
update to 0.43
changes: fixes from evolution
pkgsrc change: pull in a portability patch from evolution-data-server,
 depend on zone.tab

Log message:
Initial import of libical 0.42

an implementation of iCalendar protocols and data formats.