se provo a compilare ad esempio questo file:

codice:
#include <GL/glut.h>
#include "stdlib.h"

#define RAMPSIZE 16
#define RAMP1START 32
#define RAMP2START 48

static float rotAngle = 0.;

/*  Initialize antialiasing for color index mode,
 *  including loading a green color ramp starting
 *  at RAMP1START, and a blue color ramp starting
 *  at RAMP2START. The ramps must be a multiple of 16.
 */
void init(void)
{
   int i;

   for (i = 0; i < RAMPSIZE; i++) {
      GLfloat shade;
      shade = (GLfloat) i/(GLfloat) RAMPSIZE;
      glutSetColor(RAMP1START+(GLint)i, 0., shade, 0.);
      glutSetColor(RAMP2START+(GLint)i, 0., 0., shade);
   }

   glEnable (GL_LINE_SMOOTH);
   glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE);
   glLineWidth (1.5);

   glClearIndex ((GLfloat) RAMP1START);
}

/*  Draw 2 diagonal lines to form an X
 */
void display(void)
{
   glClear(GL_COLOR_BUFFER_BIT);

   glIndexi(RAMP1START);
   glPushMatrix();
   glRotatef(-rotAngle, 0.0, 0.0, 0.1);
   glBegin (GL_LINES);
      glVertex2f (-0.5, 0.5);
      glVertex2f (0.5, -0.5);
   glEnd ();
   glPopMatrix();

   glIndexi(RAMP2START);
   glPushMatrix();
   glRotatef(rotAngle, 0.0, 0.0, 0.1);
   glBegin (GL_LINES);
      glVertex2f (0.5, 0.5);
      glVertex2f (-0.5, -0.5);
   glEnd ();
   glPopMatrix();

   glFlush();
}

void reshape(int w, int h)
{
   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   if (w <= h) 
      gluOrtho2D (-1.0, 1.0, 
         -1.0*(GLfloat)h/(GLfloat)w, 1.0*(GLfloat)h/(GLfloat)w);
   else 
      gluOrtho2D (-1.0*(GLfloat)w/(GLfloat)h, 
         1.0*(GLfloat)w/(GLfloat)h, -1.0, 1.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}

void keyboard(unsigned char key, int x, int y)
{
   switch (key) {
      case 'r':
      case 'R':
         rotAngle += 20.;
         if (rotAngle >= 360.) rotAngle = 0.;
         glutPostRedisplay();	
         break;
      case 27:  /*  Escape Key */
         exit(0);
         break;
      default:
         break;
    }
}

/*  Main Loop
 *  Open window with initial window size, title bar, 
 *  color index display mode, and handle input events.
 */
int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_SINGLE | GLUT_INDEX);
   glutInitWindowSize (200, 200);
   glutCreateWindow (argv[0]);
   init();
   glutReshapeFunc (reshape);
   glutKeyboardFunc (keyboard);
   glutDisplayFunc (display);
   glutMainLoop();
   return 0;
}
mi da questi errori:

codice:
Compilatore: Default compiler
Building Makefile: "C:\Documents and Settings\Rocco\Desktop\glui\prog\prova\Makefile.win"
Esecuzione di  make...
make.exe -f "C:\Documents and Settings\Rocco\Desktop\glui\prog\prova\Makefile.win" all
gcc.exe -c main.c -o main.o -I"C:/Dev-Cpp/include"  

gcc.exe main.o  -o "Esercizio1.exe" -L"C:/Dev-Cpp/lib" -mwindows -lopengl32

main.o(.text+0x15):main.c: undefined reference to `__glutInitWithExit'
main.o(.text+0x30):main.c: undefined reference to `__glutCreateWindowWithExit'
main.o(.text+0x4c):main.c: undefined reference to `__glutCreateMenuWithExit'
main.o(.text+0x8e):main.c: undefined reference to `glutSetColor'
main.o(.text+0xa4):main.c: undefined reference to `glutSetColor'
main.o(.text+0xbb):main.c: undefined reference to `_imp__glEnable'
main.o(.text+0xd2):main.c: undefined reference to `_imp__glHint'

main.o(.text+0xe4):main.c: undefined reference to `_imp__glLineWidth'
main.o(.text+0xf6):main.c: undefined reference to `_imp__glClearIndex'
main.o(.text+0x111):main.c: undefined reference to `_imp__glClear'
main.o(.text+0x120):main.c: undefined reference to `_imp__glIndexi'
main.o(.text+0x12a):main.c: undefined reference to `_imp__glPushMatrix'
main.o(.text+0x145):main.c: undefined reference to `_imp__glRotatef'
main.o(.text+0x154):main.c: undefined reference to `_imp__glBegin'
main.o(.text+0x16b):main.c: undefined reference to `_imp__glVertex2f'
main.o(.text+0x182):main.c: undefined reference to `_imp__glVertex2f'
main.o(.text+0x18c):main.c: undefined reference to `_imp__glEnd'
main.o(.text+0x193):main.c: undefined reference to `_imp__glPopMatrix'
main.o(.text+0x19f):main.c: undefined reference to `_imp__glIndexi'
main.o(.text+0x1a9):main.c: undefined reference to `_imp__glPushMatrix'
main.o(.text+0x1bf):main.c: undefined reference to `_imp__glRotatef'
main.o(.text+0x1ce):main.c: undefined reference to `_imp__glBegin'
main.o(.text+0x1e5):main.c: undefined reference to `_imp__glVertex2f'
main.o(.text+0x1fc):main.c: undefined reference to `_imp__glVertex2f'
main.o(.text+0x206):main.c: undefined reference to `_imp__glEnd'
main.o(.text+0x20d):main.c: undefined reference to `_imp__glPopMatrix'
main.o(.text+0x214):main.c: undefined reference to `_imp__glFlush'
main.o(.text+0x239):main.c: undefined reference to `_imp__glViewport'
main.o(.text+0x24b):main.c: undefined reference to `_imp__glMatrixMode'
main.o(.text+0x255):main.c: undefined reference to `_imp__glLoadIdentity'
main.o(.text+0x298):main.c: undefined reference to `_imp__gluOrtho2D'
main.o(.text+0x2d8):main.c: undefined reference to `_imp__gluOrtho2D'

main.o(.text+0x2ea):main.c: undefined reference to `_imp__glMatrixMode'
main.o(.text+0x2f4):main.c: undefined reference to `_imp__glLoadIdentity'
main.o(.text+0x37b):main.c: undefined reference to `glutPostRedisplay'
main.o(.text+0x3c4):main.c: undefined reference to `glutInitDisplayMode'
main.o(.text+0x3d9):main.c: undefined reference to `glutInitWindowSize'
main.o(.text+0x3fe):main.c: undefined reference to `glutReshapeFunc'
main.o(.text+0x40e):main.c: undefined reference to `glutKeyboardFunc'
main.o(.text+0x41e):main.c: undefined reference to `glutDisplayFunc'
main.o(.text+0x426):main.c: undefined reference to `glutMainLoop'

make.exe: *** [Esercizio1.exe] Error 1

Esecuzione terminata
nella cartella GL che si trova nella cartella include del dev-cpp ho copiato questi files:



nella cartella lib sempre nella cartella del dev-cpp ho copiato il file glut32.lib

poi non ho fatto altro... dovevo copiare qualke altro file che ha a che vedere con le librerie o solo solo questi qui che ho già copiato ?