I finally was able (after giving up previously) to get my homelink to work with my community gate. 
1. Press the button you want to program and hold (the light next to the homelink button will flash slowly).
2. Hold the remote 3.5 inches from the button (keep holding the homelink button down).
3. Press the remote several times until you see the light next to the homelink button flashing rapidly. Then you can let go of all buttons and it should work on the gate.
4. You may have to do this several times adjusting the distance of the remote from the homelink button (I had too).
1. Press the button you want to program and hold (the light next to the homelink button will flash slowly).
2. Hold the remote 3.5 inches from the button (keep holding the homelink button down).
3. Press the remote several times until you see the light next to the homelink button flashing rapidly. Then you can let go of all buttons and it should work on the gate.
4. You may have to do this several times adjusting the distance of the remote from the homelink button (I had too).
