I doubt anyone would make eye contact to those they were uncomfortable with. Usually people tend to give eye contact to those they are comfortable with, those they like, etc. So does eye contact generally mean that person has a positive feeling towards you? Or could someone make eye contact with anyone, regardless? .
Most Helpful Guy
If they make eye contact and they smile when they see you or talk to you, (watch that the eyes kinda scrunch up too, that shows that its a genuine smile) then you can safely assume they are comfortable / happy to see you.
When people fake body language they tend to focus one one thing (eyes, posture, speech), so watch for multiple signs at once and you'll know its a subconscious decision.1