While on an approach to land at a mountain airstrip, the pilot encountered crosswinds. He stated that substantial left rudder was required to counteract a crosswind during the flare. After touchdown, the aircraft went to the left. The pilot attempted to recover with right rudder, but the airplane continued to skid left on the turf runway. Since the airplane did not have toe brakes installed, the pilot was unable to use differential braking. The airplane continued to the left, hit a ditch and stopped, collapsing the landing gear and causing substantial damage.