ATtiny 85 Code Compile Error (multiple definition)

hi,
using arduino ide 1.0.5r2 on windows
this error message i'm getting:

core.a(wiring.c.o): in function `__vector_5':
c:\program files (x86)\arduino\hardware\arduino\cores\arduino/wiring.c:49: multiple definition of `__vector_5'
sketch_sep02b.cpp.o:c:\program files (x86)\arduino/sketch_sep02b.ino:88: first defined here

the code i'm using arduino atmega 168, i've changed use timer0 on attiny 85 instead of
the timer2 on 168. original can found here:

http://interface.khm.de/index.php/lab/experiments/arduino-dds-sinewave-generator/

here version, in advance!!!   :

/*
* timer0 generates the  31250 khz clock interrupt
*/

#include "avr/pgmspace.h"

// table of 256 sine values (one sine period) stored in flash memory.
progmem  prog_uchar sine256[]  = {
  127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,176,178,181,184,187,190,192,195,198,200,203,205,208,210,212,215,217,219,221,223,225,227,229,231,233,234,236,238,239,240,
  242,243,244,245,247,248,249,249,250,251,252,252,253,253,253,254,254,254,254,254,254,254,253,253,253,252,252,251,250,249,249,248,247,245,244,243,242,240,239,238,236,234,233,231,229,227,225,223,
  221,219,217,215,212,210,208,205,203,200,198,195,192,190,187,184,181,178,176,173,170,167,164,161,158,155,152,149,146,143,139,136,133,130,127,124,121,118,115,111,108,105,102,99,96,93,90,87,84,81,78,
  76,73,70,67,64,62,59,56,54,51,49,46,44,42,39,37,35,33,31,29,27,25,23,21,20,18,16,15,14,12,11,10,9,7,6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,7,9,10,11,12,14,15,16,18,20,21,23,25,27,29,31,
  33,35,37,39,42,44,46,49,51,54,56,59,62,64,67,70,73,76,78,81,84,87,90,93,96,99,102,105,108,111,115,118,121,124

};
#define cbi(sfr, bit) (_sfr_byte(sfr) &= ~_bv(bit))
#define sbi(sfr, bit) (_sfr_byte(sfr) |= _bv(bit))
byte bb;

double dfreq;
// const double refclk=31372.549;  // =16mhz / 510
const double refclk=31376.6;      // measured

// variables used inside interrupt service declared voilatile
volatile byte icnt;              // var inside interrupt
volatile byte icnt1;             // var inside interrupt
volatile byte c4ms;              // counter incremented 4ms
volatile unsigned long phaccu;   // phase accumulator
volatile unsigned long tword_m;  // dds tuning word m

void setup()
{
  pinmode(0, output);     // pin0= pwm  output / frequency output

  setup_timer0();

  // disable interrupts avoid timing distortion
  cbi (timsk,toie0);              // disable timer0
  sbi (timsk,toie0);              // enable timer0 interrupt

  dfreq=2000.0;                    // initial output frequency = 2000.o hz
  tword_m=pow(2,32)*dfreq/refclk;  // calulate dds new tuning word

}
void loop()
{
}
//******************************************************************
// timer0 setup
// set prscaler 1, pwm mode phase correct pwm,  16000000/510 = 31372.55 hz clock
void setup_timer0() {

// timer0 clock prescaler : 1
  sbi (tccr0b, cs00);
  cbi (tccr0b, cs01);
  cbi (tccr0b, cs02);

  // timer0 pwm mode set phase correct pwm
  cbi (tccr0a, com0a0);  // clear compare match
  sbi (tccr0a, com0a1);
 
  sbi (tccr0a, wgm00);  // mode 1  / phase correct pwm
  cbi (tccr0a, wgm01);
  cbi (tccr0b, wgm02);
 
}

//******************************************************************
// timer0 interrupt service @ 31372,550 khz = 32usec
// timebase refclock dds generator
// fout = (m (refclk)) / (2 exp 32)
// runtime : 8 microseconds ( inclusive push , pop)
isr(timer0_ovf_vect) {

  phaccu=phaccu+tword_m; // soft dds, phase accu 32 bits
  icnt=phaccu >> 24;     // use upper 8 bits phase accu frequency information
                         // read value rom sine table , send pwm dac
  ocr0a=pgm_read_byte_near(sine256 + icnt);   

  if(icnt1++ == 125) {  // increment variable c4ms 4 milliseconds
    c4ms++;
    icnt1=0;
   }   
}

code: [select]

tword_m=pow(2,32)*dfreq/refclk;  // calulate dds new tuning word
no. not use pow() raise 2 power. use bit shifting. pow() returns floating point values may not accurate.

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