There are around 874 possible combinations between display and boards. As a result not all combinations are directly supported, only the most frequently used combinations like RADDS board + RADDS display. In your case I think the combination is not supported currently and the pins selected therefore do not exist on a melzi board.
You need to go to ui.h and find the controller 11 and add a section for your melzi board and set the pins you used to connect the display, then it will compile and work.