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compiling error ? Answered

compiling error "undefined reference to `RTC_DS1307::begin()' This is from a sketch I downloaded from the internet. It is supposed to be a valid operating sketch.
#include
#include
#include
#include
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
RTC_DS1307 RTC;
int tmp,Inc,hor,mIn,add=11;
int set=8;
int cge=9;
int mod=10;
int off=0;
#define buz 11
int Hor,Min,Sec;
///////////////////////////////////////Function to adjust the time//////////////////////////////////
void time()
{
int tmp=1,mins=0,hors=0,secs=0;
while(tmp==1)
{
off=0;
if(digitalRead(cge)==0)
{
Hor++;
if(Hor==24)
{
Hor=0;
}
}
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Set Alarm Time ");

lcd.setCursor(0,1);
if(Hor<=9)
lcd.print("0");
lcd.print(Hor);
lcd.print(":");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
delay(200);
lcd.setCursor(0,1);
lcd.print(" ");
lcd.print(":");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
delay(200);
if(digitalRead(set)==0)
{
hor=Hor;
EEPROM.write(add++,hor);
tmp=2;
while(digitalRead(set)==0);
}
}

while(tmp==2)
{
if(digitalRead(cge)==0)
{
Min++;
if(Min==60)
{Min=0;}
}
lcd.setCursor(0,1);
lcd.print(Hor);
lcd.print(":");
if(Min<=9)
lcd.print("0");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
lcd.print(" ");
delay(200);
lcd.setCursor(0,1);
lcd.print(Hor);
lcd.print(":");
lcd.print(" ");
lcd.print(":");
lcd.print(Sec);
lcd.print(" ");
delay(200);
if(digitalRead(set)==0)
{
mIn=Min;
EEPROM.write(add++, mIn);
tmp=0;
while(digitalRead(set)==0);
}
}
off=1;
delay(10);
}
///////////////////////////////////////////function to sound the buzzer//////////////////////////////////
void Buz()
{
if(digitalRead(set)==0)
off=0;
if(off==1)
{
digitalWrite(buz,HIGH);
delay(500);

digitalWrite(buz, LOW);
delay(500);
}
}
//////////////////////////////////////////function to compare the alarm time with current RTC time//////////////////
void TimeCheck()
{
int tem[17];
for(int i=11;i<17;i++)
{
tem[i]=EEPROM.read(i);
}
if(Hor == tem[11] && Min == tem[12] && off==1)
{
add=11;
Buz();
Buz();
lcd.clear();
lcd.print("alarm...........");
lcd.setCursor(0,1);
lcd.print("...........alarm");
Buz();
Buz();
}
}
////////////////////////////////////////////////////////////setup///////////////////////////
void setup()
{
Wire.begin();
RTC.begin();
lcd.begin(16,2);
pinMode(cge, INPUT);
pinMode(set, INPUT);
pinMode(mod, INPUT);
pinMode(buz, OUTPUT);
digitalWrite(set, HIGH);
digitalWrite(mod, HIGH);
digitalWrite(cge, HIGH);

lcd.setCursor(0,0);
lcd.print("ELECTRONICS HUB");
lcd.setCursor(0,1);
lcd.print(" Alarm Clock ");
delay(2000);

if(!RTC.isrunning())
{
RTC.adjust(DateTime(__DATE__,__TIME__));
}
}
////////////////////////////////////////////////////////////loop/////////////////////////////////////
void loop()
{
DateTime now = RTC.now();
if(digitalRead(mod) == 0)
{
current();
time();
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print(" Alarm On");
delay(2000);
}
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Time:");
lcd.setCursor(6,0);
Hor=now.hour(),DEC;
if(Hor<=9)
{
lcd.print("0");
lcd.print(Hor=now.hour(),DEC);
}
else
lcd.print(Hor=now.hour(),DEC);
lcd.print(":");
Min=now.minute(),DEC;
if(Min<=9)
{
lcd.print("0");
lcd.print(Min=now.minute(),DEC);
}
else
lcd.print(Min=now.minute(),DEC);

lcd.print(":");
Sec=now.second(),DEC;
if(Sec<=9)
{
lcd.print("0");
lcd.print(Sec=now.second(),DEC);
}
else
lcd.print(Sec=now.second(),DEC);
lcd.setCursor(0,1);
lcd.print("Date: ");
lcd.print(now.day(),DEC);
lcd.print("/");
lcd.print(now.month(),DEC);
lcd.print("/");
lcd.print(now.year(),DEC);
TimeCheck();
delay(200);
}
///////////////////////////////////////////////////////function to get current RTC time//////////////////////////////
void current()
{
lcd.setCursor(0,1);
lcd.print(Hor);
lcd.print(":");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
}

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