I am using an Application (SuiteCRM) that uses this library to connect to IMAP servers, when triggering a connection that uses the Auth_SASL library it fails with an unable to find \Javanile\Imap2\Auth_SASL. If I replace the line at the top of your library file:

Roundcube/ImapClient.php:

use Javanile\Imap2\Auth_SASL

with

use \Auth_SASL

everything works not sure if there is something missing as I cant find an alternate Auth_SASL under the Javanile\Imap2 namespace

Kind regards

Mark