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    Convert Python ports to FLAVORS. · 32512cab
    mat authored
      Ports using USE_PYTHON=distutils are now flavored.  They will
      automatically get flavors (py27, py34, py35, py36) depending on what
      versions they support.
    
      There is also a USE_PYTHON=flavors for ports that do not use distutils
      but need FLAVORS to be set.  A USE_PYTHON=noflavors can be set if
      using distutils but flavors are not wanted.
    
      A new USE_PYTHON=optsuffix that will add PYTHON_PKGNAMESUFFIX has been
      added to cope with Python ports that did not have the Python
      PKGNAMEPREFIX but are flavored.
    
      USES=python now also exports a PY_FLAVOR variable that contains the
      current python flavor.  It can be used in dependency lines when the
      port itself is not python flavored.  For example, deskutils/calibre.
    
      By default, all the flavors are generated.  To only generate flavors
      for the versions in PYTHON2_DEFAULT and PYTHON3_DEFAULT, define
      BUILD_DEFAULT_PYTHON_FLAVORS in your make.conf.
    
      In all the ports with Python dependencies, the *_DEPENDS entries MUST
      end with the flavor so that the framework knows which to build/use.
      This is done by appending '@${PY_FLAVOR}' after the origin (or
      @${FLAVOR} if in a Python module with Python flavors, as the content
      will be the same).  For example:
    
        RUN_DEPENDS= ${PYTHON_PKGNAMEPREFIX}six>0:devel/py-six@${PY_FLAVOR}
    
    PR:		223071
    Reviewed by:	portmgr, python
    Sponsored by:	Absolight
    Differential Revision:	https://reviews.freebsd.org/D12464
    32512cab