Log message:
Marked as CONFLICT each other, both package contains lib/liblzma.{a,so}.
Noticed by Jukka Salmi in pkgsrc-users@.

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:
Common/String.h confounds with case insensitive filesystem.
Remove "Common" from include path.

Log message:
Import lzmalib-0.0.1 as archivers/lzmalib.

This package includes a thin wrapper library of LZMA SDK written
by Igor Pavlov.