Running on CSIC Linux Machines:
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OpenGL and GLUT have been installed on the PCs in the CSIC Linux Lab.
Note that the library and include files are stored in different
directories on each machine.  If you have your own Linux machine, you
may need to adjust paths in the Makefile so the compiler can find the
appropriate libraries and include files.

To compile and execute the program do:

$ make
$ sample1     (or "./sample1")

A window should open up with a teapot in it.  Hit the "a", "l", or "q"
keys.

Running on your own PC with Linux:
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If you have access to a PC with Linux, you may need to install OpenGL
and GLU, and will certainly need to install GLUT yourself.  You can
check with OpenGL has already been installed by searching for the
appropriate include files (glut.h, glu.h, gl.h) and the libraries needed
for the same (libglut, libGLU, libGL).

If these have not been installed, they can be downloaded from the Web.
For OpenGL/GLU, search for "Mesa OpenGL" on google.  It is free version
of OpenGL.  For GLUT, search for "freeglut".  This is an open source
version of GLUT.  Once these have been installed, make the necessary
changes to the directory settings in the Makefile.