подключаем glut в CodeBlocks

// Simple.c
// The Simplest OpenGL program with GLUT
// OpenGL SuperBible, 3rd Edition
// Richard S. Wright Jr.
 
#include <gl/glut.h>
#include <gl/gl.h>  // System and OpenGL Stuff
 
// Called to draw scene
void RenderScene(void)
    {
    // Clear the window with current clearing color
    glClear(GL_COLOR_BUFFER_BIT);
 
 
    // Flush drawing commands
    glFlush();
    }
 
// Setup the rendering state
void SetupRC(void)
    {
    glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
    }
 
// Main program entry point
int main(int argc, char* argv[])
    {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
        glutInitWindowSize(800,600);
    glutCreateWindow("Simple");
    glutDisplayFunc(RenderScene);
 
    SetupRC();
 
    glutMainLoop();
    }

obj\Debug\main.o||In function `Z11RenderScenev':|
\1\C++Builder\glut2\main.cpp|15|undefined reference to `_imp__glClear'|
\1\C++Builder\glut2\main.cpp|19|undefined reference to `_imp__glFlush'|
obj\Debug\main.o||In function `Z7SetupRCv':|
\1\C++Builder\glut2\main.cpp|26|undefined reference to `_imp__glClearColor'|
obj\Debug\main.o||In function `main':|
\1\C++Builder\glut2\main.cpp|33|undefined reference to `glutInit'|
\1\C++Builder\glut2\main.cpp|34|undefined reference to `glutInitDisplayMode'|
\1\C++Builder\glut2\main.cpp|35|undefined reference to `glutInitWindowSize'|
\1\C++Builder\glut2\main.cpp|36|undefined reference to `glutCreateWindow'|
\1\C++Builder\glut2\main.cpp|37|undefined reference to `glutDisplayFunc'|
\1\C++Builder\glut2\main.cpp|41|undefined reference to `glutMainLoop'|
||=== Build finished: 9 errors, 0 warnings ===|