How to compile and upload the specific (.cpp + .h) code?

I have a specific arduino code (no .ino files) https://github.com/justintconroy/MdbBillValidator , which can't be opened by arduino IDE. How can I make & upload this code? I have an arduino 2560 mega.

I've created an empty MdbBillValidator.ino file and added these lines:

#include "MdbBillValidator.h"

void setup() {

}

void loop() {

}

Here is the error message

MdbSerial.cpp: In function ‘void __vector_37()’:
MdbSerial.cpp:289:23: error: ‘TXB8’ was not declared in this scope
MdbSerial.cpp:291:24: error: ‘TXB8’ was not declared in this scope
MdbSerial.cpp: In function ‘void __vector_52()’:
MdbSerial.cpp:314:23: error: ‘TXB8’ was not declared in this scope
MdbSerial.cpp:316:24: error: ‘TXB8’ was not declared in this scope
MdbSerial.cpp: In function ‘void __vector_55()’:
MdbSerial.cpp:339:23: error: ‘TXB8’ was not declared in this scope
MdbSerial.cpp:341:24: error: ‘TXB8’ was not declared in this scope
MdbSerial.cpp: At global scope:
MdbSerial.cpp:554:135: error: expected ‘)’ before numeric constant
MdbSerial.cpp:554:189: error: no matching function for call to ‘MdbSerial::MdbSerial(ring_buffer*, ring_buffer*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, int, int, int, int, int, int, int, int, int, int, int)’
MdbSerial.cpp:554:189: note: candidates are:
MdbSerial.cpp:352:1: note: MdbSerial::MdbSerial(ring_buffer*, ring_buffer*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, volatile uint8_t*, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t)
MdbSerial.cpp:352:1: note:   candidate expects 20 arguments, 19 provided
In file included from MdbSerial.cpp:38:0:
MdbSerial.h:52:7: note: MdbSerial::MdbSerial(const MdbSerial&)
MdbSerial.h:52:7: note:   candidate expects 1 argument, 19 provided