public static function activate() {
	if ( ! version_compare( PHP_VERSION, '5.3', '<' ) ) {
		return;
	}

	deactivate_plugins( 'url-embedlifier' );
	wp_die('<p>The <strong>URL Embedlifier</strong> plugin requires PHP version 5.3 or greater.</p>',
		'Plugin Activation Error',  array( 'response' => 200, 'back_link' => true ) );
}