A couple balance moves to start and gain obvious flake/shelf on the roof.  Match on flake/shelf, use good pocket for left foot and go up over a couple solid (though possibly dirty) ledges.  Use the horn feature to mantle over the hump.  May become easier with better worked out feet on the mantle and/or if the top is cleaned to reveal any better top out holds.  

[Not sure if this has been climbed before, so listing as FA here.  Please correct if wrong.]

Directly left of Inconceivable.

Pad; spotter preferred.