What is the "ld.exe cannot find -lbgi" error and how do I fix it?

Question

C++ / C#

There is Newton's fractal program. When compiling, it gives an error ld.exe cannot find -lbgi. What could it be? I've looked all over the internet and there's nothing on this topic.

#include "graphics.h"
#include <math.h>
#include <conio.h>
#define TAU 6.283185307

class complex {
public:
  float real, imag;
  complex(float r = 0, float i = 0)
  {
    real = r;
    imag = i;
  }
  complex operator + (complex const &obj)
  {
    complex res;
    res.real = real + obj.real;
    res.imag = imag + obj.imag;
    return res;
  }
  complex operator - (complex const &obj)
  {
    complex res;
    res.real = real - obj.real;
    res.imag = imag - obj.imag;
    return res;
  }
  complex operator * (complex const &obj)
  {
    complex res;
    res.real = real * obj.real - imag * obj.imag;
    res.imag = real * obj.imag + imag * obj.real;
    return res;
  }
  complex operator / (complex const &obj)
  {
    complex res;
    res.real = (real*obj.real + imag * obj.imag) / (obj.real*obj.real + obj.imag*obj.imag);
    res.imag = (-real * obj.imag + imag * obj.real) / (obj.real*obj.real + obj.imag*obj.imag);
    return res;
  }
};

float abs(complex z)
{
  return sqrt(z.real*z.real + z.imag*z.imag);
}

float arg(complex z)
{
  return atan2(z.imag, z.real);
}

complex pow(complex z, int n)
{
  int i;
  complex z1 = complex(1, 0);
  for (i = 0; i < n; i++)
    z1 = z1 * z;
  return z1;
}

complex f(complex z)
{
  return pow(z, 3) - 1;
}

complex df(complex z)
{
  return z * z * 3;
}

int main() {
  int gd, gm, i, j, k, iter = 100, shift = 5;
  float tol = 0.0001;
  complex z;
  detectgraph(&gd, &gm);
  initgraph(&gd, &gm, "D:\\Users\\San\\Desktop\\bgi");
  delay(2000);
  for (i = 0; i <= 675; i++)
  {
    for (j = 0; j <= 675; j++)
    {
      z = complex(i*4.0 / 675 - 2, -j * 4.0 / 675 + 2);
      for (k = 0; k < iter; k++)
      {
        if (abs(f(z)) < tol)
          break;
        z = z - f(z) / df(z);
      }
      if (k != iter)
      {
        putpixel(i, j, 1 + (k + shift) % 14);
        putpixel(i + 675, j, 1 + int(shift + tol + (arg(z) * 14 / TAU + 8)) % 14);
      }
    }
  }
  getch();
  closegraph();
  return 0;
}

Answer 1

perhaps there is a solution https://stackoverflow.com/questions/21091574/ld-ex...
or here https://www.google.com/search?client=opera-gx&q=ld...