Multiple definitions error with TIMER0_OVF_vect

i'm using program (written else), uses isr(timer0_ovf_vect).  when try compile in arduino ide (v1.05)  multiple definition error because arduino's wiring.c uses timer0_ovf_vect.  wiring.c isn't used program, guess arduino checks anyway.   the author doesn't compile using arduino ide, doesn't have worry this.
i don't know interrupts , don't know 1 timer0_ovf_vect represents.  how rid of error?  have feeling it's more complex renaming something.

the program can found here: https://github.com/grbl/grbl/tree/dev
the specific file is  stepper.c, line 419

code: [select]

int main()
{
  // setup code goes here

  while (1)
  {
    // loop code goes here
  }
}

you responsible initializing else: timers pwm, adc, whatever else can't think of right now.

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