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    Features are created using these keyword arguments:

      'description' -- a short, human readable description of the feature, to
         be used in error messages, and option help messages.

      'standard' -- if true, the feature is included by default if it is
         available on the current system.  Otherwise, the feature is only
         included if requested via a command line '--with-X' option, or if
         another included feature requires it.  The default setting is 'False'.

      'available' -- if true, the feature is available for installation on the
         current system.  The default setting is 'True'.

      'optional' -- if true, the feature's inclusion can be controlled from the
         command line, using the '--with-X' or '--without-X' options.  If
         false, the feature's inclusion status is determined automatically,
         based on 'availabile', 'standard', and whether any other feature
         requires it.  The default setting is 'True'.

      'require_features' -- a string or sequence of strings naming features
         that should also be included if this feature is included.  Defaults to
         empty list.  May also contain 'Require' objects that should be