A network alert has been sent out notifying everyone of the v1.1 mandatory update. If you're seeing it on your local wallet, it is intentional and was sent by us. If you've already upgraded to version 1.1, you have nothing to worry about. The alert will expire in 4 days
Getting this error while compiling:

configure: error: No working boost sleep implementation found. If on ubuntu 13.10 with libboost1.54-all-dev remove libboost.1.54-all-dev and use libboost1.53-all-dev