* \brief Accepts messages and inserts them into a message queue, then notifies
* subclass gr_basic_block there is a message pending.
*/
-class gr_msg_accepter : gruel::msg_accepter_msgq
+class gr_msg_accepter : public gruel::msg_accepter_msgq
{
public:
gr_msg_accepter(gruel::msg_queue_sptr msgq);