Hello,
I successfully installed Mesa with "yum install Mesa*" and downloaded MesaDemos-7.8.tar.gz archive.
Now I try follow instructions from "Mesa3d.org -> Download / Insall -> Compiling and Installing -> 1.5 Running the demos",
but in progs/demos there is only *.c files, when I try to compile them,
I get many similar errors like:

gears.c:(.text+0x54): undefined reference to `glShadeModel'  

I guess that this is very noob question, and I understand that there is very simple solution, but I haven't any idea...
In beggining of the file there are all necessary #includes:

#include <math.h>  
#include <stdlib.h>  
#include <stdio.h>  
#include <string.h>  
#include <GL/glut.h>  

So I have some questions:
Is there some Mesa forum on the web?
Is there some compiled demos?
Is there some site with well described examples of Mesa using?
What I need for compile those examples?

I have CentOS 5

Thank you for ahead.