Possible arguments: (none), 48,
      5 (default), 6
Add dependency on the Berkeley DB
      library.  Default to databases/db5.  It can also depend on
      databases/db48 when using the
      :48 argument or databases/db6 with
      :6.  It is possible to declare a range of
      acceptable values, :48+ finds the highest
      installed version, and falls back to 4.8 if nothing else is
      installed.  INVALID_BDB_VER can be used to
      specify versions which do not work with this port.  The
      framework exposes the following variables to the port:
BDB_LIB_NAMEThe name of the Berkeley DB
	    library.  For example, when using databases/db5, it contains
	    db-5.3.
BDB_LIB_CXX_NAMEThe name of the Berkeley DB
	    C++ library.  For example, when
	    using databases/db5, it
	    contains db_cxx-5.3.
BDB_INCLUDE_DIRThe location of the Berkeley
	      DB include directory.  For example, when
	    using databases/db5, it
	    will contain
	    ${LOCALBASE}/include/db5.
BDB_LIB_DIRThe location of the Berkeley
	      DB library directory.  For example, when
	    using databases/db5, it
	    contains ${LOCALBASE}/lib.
BDB_VERThe detected Berkeley DB
	    version.  For example, if using
	    USES=bdb:48+ and Berkeley
	      DB 5 is installed, it contains
	    5.
databases/db48 is deprecated and unsupported. It must not be used by any port.
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