@stez90: It looks like the sketch is trying to declare something that the libraries can't resolve.... i tried to convert a similar project from the MEGA to the DUE and ran into sh#tload of errors because of incompatible libraries and different voltages... so i took another path.
Which sketch are you running?
@Aguther: All information you need to know should be found is in this thread.. the ts7787 driver worked for one of my TFT's but the other 4 needed a tweak in the ADAfruit.cpp setting the driver manually to x9341 to work properly as they all had the "unknown driver" error.
If it doesn't work with the x9341 you just have to try the next one and so on until you find which it is.
It also may work with the advice from casemod but i only tried jstarchers so i guess you'll have to find this out by yourself.
@rmohan10: The ADAfruit one's should be able to run the 2.8".. look at their pages to find the latest files.
Good luck