How do I hug a person of the opposite sex if we're friends?

We're good friends; nothing more (there was a bit of a spark and attraction between us but I want to stress to him that we're strictly friends). I'll be seeing him for the first time in months this summer. How would I hug him to just let him know it's good to see him as a friend and that I miss him. The traditional one arm around his neck? I always thought the two-handed behind the neck meant something more and I don't want to give him mixed signals. He's an older man if that makes any difference.
How do I hug a person of the opposite sex if we're friends?
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