fgError( "Fatal error in program. NULL display callback not "
"permitted in GLUT 3.0+ or freeglut 2.0.1+\n" );
SET_CALLBACK( Display );
fgError( "Fatal error in program. NULL display callback not "
"permitted in GLUT 3.0+ or freeglut 2.0.1+\n" );
SET_CALLBACK( Display );