The pilot landed on runway 33. When the airplane was approximately midfield, 'a gust of wind overcame my ability to keep the airplane in center of runway,' and 'caused me to yaw to the right.' The wind gust was encountered just as the tail wheel was about to touch down, 'when rudder is least effective.' The airplane ground looped, shearing the attach bolts on the left main landing gear and causing it to collapse. The right wing also sustained damage. Reported winds were from 010 degrees at 5 knots.