Fatal error adding dropbox backup location with HHVM

I use HHVM rather than PHP-FPM and trying to add a dropbox account for backups I encounter the following error:

Fatal error: Uncaught HTTP_OAuth_Exception: Need OpenSSL support for https:// requests in /home/<userdir>/www/wp-content/plugins/snapshot/lib/destinations/dropbox/includes/PEAR_Includes/HTTP/OAuth/Consumer.php on line 257

Do you test or support the plugins under HHVM?