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:
Fix C++ build on NetBSD 5.x. Bump revision of gcc3-c.
Inspired by patch from Aran Clauson in the GCC Bugzilla.

Log message:
Move code that generates a dynamic PLIST from the {pre,do,post}-install
targets and into a GENERATE_PLIST variable definition.  Remove some
unnecessary empty PLISTs as a result of properly setting GENERATE_PLIST.

Log message:
Remove empty PLISTs from pkgsrc since revision 1.33 of plist/plist.mk
can handle packages having no PLIST files.

Log message:
Added support for installation to DESTDIR.

Log message:
The v7 and v9 directories on SunOS may not exist so only try and remove
them if they do exist.

Log message:
Fixed pkglint warnings.

Log message:
Replace mk/bsd.prefs.mk includes with bsd.fast.prefs.mk includes.
The redundant parsing of bsd.prefs.mk is mostly avoided now and
parse time e.g. for x11/kdebase3 gets reduced by up to 10%.

Log message:
Update gcc3-* to 3.3.6.  Fix build of gcc3-f77 and gcc3-java on
NetBSD-current.

Log message:
Set MAKE_ENV+=SHELL=${CONFIG_SHELL} for all gcc packages. Fixes SHELL set
to non sh compatible shell in environment. Thanks to Georg Schwarz.