undefined reference to by using auto from cpp 17

Question

I try compile this code

#include <utility>                                                               
#include <stdexcept>                                                             
#include <tuple>                                                                 
#include <typeinfo>                                                              
#include <iostream>                                                              

int main(int argc, char** argv) {                                                
std::pair<int, int> divide_remainder(int dividend, int divisor);               
const auto result (divide_remainder(16, 3));                                   

// auto [fraction, remainder] = divide_remainder(16, 3);                       
// const auto result (divide_remainder(16, 3));                                
//std::cout << "16 / 3 is " << result.first << " with a remainder of "         
    //<< result.second << '\n';                                                 
 return 0;                                                                      
}   

with that command

g++  -std=c++1z featuresMain.cpp

and get this error

featuresMain.cpp:(.text+0x29): undefined reference to `divide_remainder(int, int)'

Does anyone know why?