DMXSerial.cpp :Serial 2: 17 (RX) and 16 (TX)

I am wanting to use Mega with DMXSerial I found this in the .cpp file and was wanting to know what to change to use Serial 2: 17 (RX) and 16 (TX)

#elif !defined(DMX_USE_PORT1) && defined(USART0_RX_vect)
// These definitions are used on ATmega1280 and ATmega2560 boards
// like the Arduino MEGA boards
#define UCSRnA UCSR0A
#define TXCn   TXC0
#define UCSRnB UCSR0B
#define RXCIEn RXCIE0
#define TXCIEn TXCIE0
#define UDRIEn UDRIE0
#define RXENn  RXEN0
#define TXENn  TXEN0
#define UCSRnC UCSR0C
#define USBSn  USBS0
#define UCSZn0 UCSZ00
#define UPMn0  UPM00
#define UBRRnH UBRR0H
#define UBRRnL UBRR0L
#define UDRn   UDR0
#define UDREn  UDRE0
#define FEn    FE0
#define USARTn_RX_vect   USART0_RX_vect
#define USARTn_TX_vect   USART0_TX_vect
#define USARTn_UDRE_vect USART0_UDRE_vect

was wanting to know what to change to use Serial 2

As opposed to? Serial0? Perhaps the suffix is a clue...