OpenGl and GLEW on Mac?

Hello I am trying to install GLEW on my Mac operating system for my computer graphics course. The instructions to get C++ working with OpenGL are below. I am having trouble installing GLEW. That link below does not seem to exist. What are some ways to have my computer graphics code with C++ work on my Mac. I am also including the sample code that's in the textbook. As of now I am not able to run that C++ code I'm guessing because I have not downloaded GLEW or/and have not configured all the settings to work with that.

////////////////////////////////////////////////////

// square.cpp

//

// Stripped down OpenGL program that draws a square.

//

// Sumanta Guha.

////////////////////////////////////////////////////

#include <iostream>

#ifdef __APPLE__

# include <GLUT/glut.h>

#else

# include <GL/glut.h>

#endif

using namespace std;

// Drawing (display) routine.

void drawScene(void)

{

// Clear screen to background color.

glClear(GL_COLOR_BUFFER_BIT);

// Set foreground (or drawing) color.

glColor3f(0.0, 0.0, 0.0);

// Draw a polygon with specified vertices.

glBegin(GL_POLYGON);

glVertex3f(20.0, 20.0, 0.0);

glVertex3f(80.0, 20.0, 0.0);

glVertex3f(80.0, 80.0, 0.0);

glVertex3f(20.0, 80.0, 0.0);

glEnd();

// Flush created objects to the screen, i.e., force rendering.

glFlush();

}

// Initialization routine.

void setup(void)

{

// Set background (or clearing) color.

glClearColor(1.0, 1.0, 1.0, 0.0);

}

// OpenGL window reshape routine.

void resize(int w, int h)

{

// Set viewport size to be entire OpenGL window.

glViewport(0, 0, (GLsizei)w, (GLsizei)h);

// Set matrix mode to projection.

glMatrixMode(GL_PROJECTION);

// Clear current projection matrix to identity.

glLoadIdentity();

// Specify the orthographic (or perpendicular) projection,

// i.e., define the viewing box.

glOrtho(0.0, 100.0, 0.0, 100.0, -1.0, 1.0);

// Set matrix mode to modelview.

glMatrixMode(GL_MODELVIEW);

// Clear current modelview matrix to identity.

glLoadIdentity();

}

// Keyboard input processing routine.

void keyInput(unsigned char key, int x, int y)

{

switch(key)

{

// Press escape to exit.

case 27:

exit(0);

break;

default:

break;

}

}

// Main routine: defines window properties, creates window,

// registers callback routines and begins processing.

int main(int argc, char **argv)

{

// Initialize GLUT.

glutInit(&argc, argv);

// Set display mode as single-buffered and RGB color.

glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

// Set OpenGL window size.

glutInitWindowSize(500, 500);

// Set position of OpenGL window upper-left corner.

glutInitWindowPosition(100, 100);

// Create OpenGL window with title.

glutCreateWindow("square.cpp");

// Initialize.

setup();

// Register display routine.

glutDisplayFunc(drawScene);

// Register reshape routine.

glutReshapeFunc(resize);

// Register keyboard routine.

glutKeyboardFunc(keyInput);

// Begin processing.

glutMainLoop();

return 0;

}