Possible arguments:
      7, module,
      theme
Automate installation of a port that is a
      Drupal theme or module.  Use with the
      version of Drupal that the port is expecting.  For example,
      USES=drupal:7,module says that this port
      creates a Drupal 6 module.  A Drupal 7 theme can be specified
      with USES=drupal:7,theme.
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