(1) Add new variable USE_NEWGCC. Set this if your port requires the

    latest gcc.  This is currently the system compiler in 4-current and
    ports/lang/egcs in 3-stable.

    Setting USE_NEWGCC is a no-op if the compiler required is in the
    system.  If it is to be provided by a port, it will cause the
    variables "CC" and "CXX" to be set to the names of executables for
    the C and C++ compiler, and adds a BUILD_DEPENDS on the
    appropriate port.
Reviewed by: Chris Piazza <cpiazza@home.net> and Ade Lovett <ade@lovett.com>

(2) Add new variables CHMOD and CHOWN, set to full pathnames of those
    commands.  (Used in 3)

(3) When run as root, change owner:group of all files under ${WRKDIR}
    to 0:0 after extraction.  Set EXTRACT_PRESERVE_OWNERSHIP to turn
    off this feature.
Problem reported by: Slawek Zak <zaks@prioris.im.pw.edu.pl>
Reviewed by:	 the ports list

(4) Update MASTER_SITE_XCONTRIB.
PR:		12879
Submitted by:	Will Andrews <andrews@technologist.com>

(5) Update MASTER_SITE_GNU.
Submitted by:	Ralf "pth update of the day" Engelschall <rse@engelschall.com>

(6) Add check for valid categories.  If the port is not in a
    pre-approved list of categories, install will fail.  If you need a
    local addition, put it in variable VALID_CATEGORIES.
Reviewed by:	 the ports list

(7) Experimental feature: DEPENDS_CLEAN.  Define this variable and
    bsd.port.mk will attempt to run "make install clean" instead of
    "make install" when building dependencies.  Might be useful if you
    are building a port with a large number of dependencies without
    the benefit of a large disk.

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