try to find glut library and include files.
This module defines the
- Defined if the system has GLUT.
This module sets the following variables:
GLUT_INCLUDE_DIR, where to find GL/glut.h, etc. GLUT_LIBRARIES, the libraries to link against GLUT_FOUND, If false, do not try to use GLUT.
Also defined, but not for general use are:
GLUT_glut_LIBRARY = the full path to the glut library. GLUT_Xmu_LIBRARY = the full path to the Xmu library. GLUT_Xi_LIBRARY = the full path to the Xi Library.