to RFM12B_arssi.h and

#elif defined(AVR_ATmega2560) || defined(AVR_ATmega1280)
if (irq_pin==10 || irq_pin==11 || irq_pin==2)
{
// 1st detach the existing one
detachInterrupt(irq_pin==2?2:irq_pin-10);

irq_pin = irqPin;

}
else
{
// Set new pin
irq_pin = RFM_DEFAULT_IRQ;
}

to the function void RFM12B::SetIRQ(uint6_t irqPin) in RFM12B_ arssi.cpp and

#elif defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
  //  IRQ authorized are D10 (INT0), D11 (INT1) or D2 (INT4) added by me :) 
  if (irq_pin==10 || irq_pin==11 || irq_pin==2)
  {
    if (nodeID != 0)
      // INT0 or INT1 for pin D10/D11 and INT2 for pin D2
      attachInterrupt(irq_pin==2?2:irq_pin-10, RFM12B::InterruptHandler, LOW);
    else
      // INT0 or INT1 for pin D10/D11 and INT2 for pin D2
      detachInterrupt(irq_pin==2?2:irq_pin-10);
  }

to RFM12B_arssi.cpp in the function RFM12B:: ConfigureInterrupts(); This does not work and it fails the detection in radio.isPresent. Any help would be greatly appreciated.