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Usage

Zend Gdata Interfaces is automatically made available in the PHP include path.

You may check Zend Gdata Interfaces availability using the WP_ZEND_GDATA_INTERFACES constant. Here is an example of how to do that in your plugin code:

function check_for_zend_gdata_interfaces() {
  // if the Zend Gdata Interfaces plugin is successfully
  // loaded this constant is set to true
  if (defined('WP_ZEND_GDATA_INTERFACES') && 
     constant('WP_ZEND_GDATA_INTERFACES')) {
    return true;
  }
  // you can also check if the Zend Gdata Interfaces are 
  // available on the system
  $paths = explode(PATH_SEPARATOR, get_include_path());
  foreach ($paths as $path) {
    if (file_exists("$path/Zend/Loader.php")) {
      define('WP_ZEND_GDATA_INTERFACES', true);
      return true;
    }
  }
  // nothing found, you may advice the user to install 
  // the Zend Gdata Interfaces plugin
  define('WP_ZEND_GDATA_INTERFACES', false);
}

add_action('init', 'check_for_zend_gdata_interfaces');