Install OpenGL library

For installing OpenGL, again, make sure you follow the instructions carefully. In this section, we will point you to verified approaches to get going with OpenGL on CSIL and your own Linux, Windows, or MacOS computers. OpenGL is available for all modern operating systems, but you will need to make sure you have the latest drivers for your computer GPU in order for it to work properly, or install a software-only implementation (e.g. Mesa).

Once you have the proper libraries installed, you will need to link those libraries and include the proper header files for OpenGL/GLUT development

CSIL

OpenGL is already installed for you on CSIL. Include the following header files: 
	#include <GL/gl.h>
	#include <GL/glu.h>  
	#include <GL/glut.h>
Additionally, you will need to point the linker to several libraries. This can be accomplished with CMake by adding the following lines to your CMakeLists.txt 
	FIND_PACKAGE( OpenGL )
	FIND_PACKAGE( GLU )
	FIND_PACKAGE( GLUT )
and update your target link libraries to also include ${OpenGL_LIBRARY}, ${GLU_LIBRARY} and ${GLUT_LIBRARY}.

Alternatively, for command-line compilation/linking, you can use the following flags for g++ or ld: "-lGL -lGLU -lglut". X11 libraries (-L/usr/X11R6/lib/ -lXmu -lXi -lXext -lX11 -lXt) apparently don't currently need to be specified.

Your own Linux system or Windows system

Both Linux and Windows system will likely require you to download drivers specific to your graphics card. Unfortunately, these drivers are not consistent in their installation and will likely install in different folders on your machine depending on which driver you need. Instructions for downloading and installing these drivers can be found on the OpenGL website. Linux and Windows users will also likely need to install GLUT or FreeGlut. If you are developing under MinGW, you can follow these instructions.

On your own Linux system, the include and library specifications are likely similar to the ones on CSIL.

On Windows, you will likely have to link against the libraries opengl32.lib, glut32.lib, glu32.lib that were installed in previous steps. This can be done both with MinGW and CMake or within an IDE such as Visual Studio. You will have to include the following lines in source code:
#include <gl/gl.h>
#include <gl/glu.h>
#include <gl/glut.h>
#include <windows.h>

Your own MacOS system

Luckily, MacOS installs OpenGL as part of the OS, and OpenGL updates are pushed with regular software updates. Before beginning, make sure you have the latest software update on your Mac.
Your include lines on this platform should be:
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <GLUT/glut.h>
If you want to compile/link from the Terminal command line, add the following flags: -framework OpenGL -framework GLUT