opengl - glFogCoordf was not declared in this scope -

i working through examples of opengl programming guide version 2.1

i know should using opengl version 4, because obsolete, , working way version 4, don't worry that.

the problem have 1 of examples uses 'glfogcoordf' function apparently doesn't exist!

code:

#include <gl/glut.h> #include <cstdlib> #include <iostream>  static glfloat f1, f2, f3;  static void init() {     glfloat fogcolor[4] = { 0.0, 0.25, 0.5, 1.0 };     f1 = 1.0f;     f2 = 5.0f;     f3 = 10.0f;      glenable(gl_fog);     glfogi(gl_fog_mode, gl_exp);     glfogfv(gl_fog_color, fogcolor);     glfogf(gl_fog_density, 0.25);     glhint(gl_fog_hint, gl_dont_care);     glfogi(gl_fog_coord_src, gl_fog_coord);      glclearcolor(0.0, 0.25, 0.25, 1.0); }  void display() {     glclear(gl_color_buffer_bit | gl_depth_buffer_bit);      glcolor3f(1.0f, 0.75f, 0.0f);     glbegin(gl_triangles);     glfogcoordf(f1);     glvertex3f(2.0f, -2.0f, 0.0f);     glfogcoordf(f2);     glvertex3f(-2.0f, 0.0f, -5.0f);     glfogcoordf(f3);     glvertex3f(0.0f, 2.0f, -10.0f);     glend();      glutswapbuffers(); } 

all other gl...() functions have worked before, glfogcoord{fd}() , glfogcoord{fd}v() don't seem exist... have never had either of these 2 working, , code completion thing inside codeblocks doesn't recognise completions 'glfog'.

anyone know reason might be?

glfogcoord():

notes

glfogcoord available if gl version 1.4 or greater.

check gl_version. if it's 1.1 you're probably using windows. opengl32.dll exports opengl 1.1 api.

use glew load "new" api entry points.