GMP Compile Error

recurphy_at_yahoo.com
Date: 05/31/04 

Date: 31 May 2004 08:38:56 -0700

I tried to use GMP on a Unix machine, but received errors. What should I do?

C++ Code:
#include <iostream>
#include <gmp.h>

int
main ()
{
  mpz_t z;
  mpz_init (z);
  cin >> z;
  cout << z << endl;
}

Command:
g++ gmp.cpp

Message:
Undefined first referenced
 symbol in file
__gmpz_init /var/tmp/ccvV4wON.o
__ls__FR7ostreamPC12__mpz_struct /var/tmp/ccvV4wON.o
__rs__FR7istreamP12__mpz_struct /var/tmp/ccvV4wON.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status