If I change the user sketch to include the FIFO library:
#include <FIFO.h>
#include <RCXIR.h>
void setup()
{
Serial.begin(2400);
Serial.println("");
// This code will only run once, after each powerup or reset of the board
}
void loop()
{
// This code will loops consecutively
}
Then the compiler output is as follows:
RCXIR\RCXIR.cpp.o: In function `RCXIRsetup(unsigned char, unsigned char)':
C:\Users\Family\Dropbox\Matt's Technology\Arduino\Sketch Book\libraries\RCXIR/RCXIR.cpp:18: multiple definition of `FIFO'
RCXIR_Test.cpp.o:(.bss.FIFO+0x0): first defined here