Try some wet food or lunchmeat. Try getting him used to you by spending more time outside getting him to come to you.

If he's just hiding under your porch or somewhere else slightly less than attainable (meaning, you can see him but can't reach him), then you can heat some milk or food up. Then, put it inside a crate and when he's in then shut the door and latch it. That's what I did with Lily except for she was stuck in the insides of a car.