Cyclone IV transceiver Dev Kit Example compiles with errors.

OCT means On chip Termination. There needs to be resistors on both sides of the tranmissions lines, to prevent reflections of the signal. You will have to set OCT according to the other devices atached to it. Apparently 100 Omhs isn't supported by your device, so you will have either choose 150 or 85 ohms. If your device already had on board resisters at the transmissions lines you will have to chose OFF, but usually the latter isn't the case.