FreeGLUT

#include <iostream>
#include <GL/freeglut.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <GL/gl.h>

void display() {
 glClear(GL_COLOR_BUFFER_BIT);
 glBegin(GL_POLYGON);
  glVertex2f(-0.5, -0.5);
  glVertex2f(-0.5, 0.5);
  glVertex2f(0.5, 0.5);
  glVertex2f(0.5, -0.5);
 glEnd();
 glFlush();
}

int main(int argc, char** argv){
 glutInit(&argc, argv);
 glutCreateWindow("Hello, Square");
 glutDisplayFunc(display);
 glutMainLoop();
 return 0;
}

/tmp/ccjA7KCD.o: In function display()': 1.cpp:(.text+0xa): undefined reference toglClear'
1.cpp:(.text+0x14): undefined reference to glBegin' 1.cpp:(.text+0x29): undefined reference toglVertex2f'
1.cpp:(.text+0x3e): undefined reference to glVertex2f' 1.cpp:(.text+0x53): undefined reference toglVertex2f'
1.cpp:(.text+0x68): undefined reference to glVertex2f' 1.cpp:(.text+0x6d): undefined reference toglEnd'
1.cpp:(.text+0x72): undefined reference to glFlush' /tmp/ccjA7KCD.o: In functionmain':
1.cpp:(.text+0x96): undefined reference to glutInit' 1.cpp:(.text+0xa0): undefined reference toglutCreateWindow'
1.cpp:(.text+0xaa): undefined reference to glutDisplayFunc' 1.cpp:(.text+0xaf): undefined reference toglutMainLoop'
collect2: error: ld returned 1 exit status