The advice you are getting is good. Time and patience and consistency. Feed the cat. Be outside and talk quietly without making eye contact to get it used to you. Avoid sudden movements and don't grab at the cat...if you can trap it and move the operation inside that is one thing, but if you are working to tame it first, let it learn you are not a threat. Doing a quiet hobby outside with delicious smelly food nearby is one way of attracting the cat to come close. Cats getting used to each other do not stare... so keep eye contact brief and try to present a low profile.... sit or crouch and let kitty come to you. This process can vary in time depending on the cat. I've tamed ferals that turned into snuggle babies and also had ones that would purr loudly at love-talk but never accepted more that a brief butterfly brush of hand contact. Depends on the personality of the cat. Good luck and keep at it. In my opinion these cats often make the best friends.