Summer City on VHS video. Starring John Jarratt, Phillip Avalon, Steve Bisley, Mel Gibson. Directed by Christopher Fraser. 1977.
From the VHS box cover:
Mel Gibson in his movie debut
Mel Gibson in his film debut stars in this Australian teen rebel film. Four wild friends go on a surfing weekend at a sleepy little seaside community only to find trouble when one of them gets involved with a local’s daughter. Fun-and-sun surfing film complete with romance, hot rods, and murder.
DVD upgrade: Summer City