Buidling simple applications under OSX is similar to building them
under linux with the following changes:

The glut.h file is stored under a GLUT directory so the include
statement in your application should be

#include <GLUT/glut.h>

The compiler options should be

-framework OpenGL -framework GLUT -framework Foundation

Thus a very simple compile would be

gcc simple.c -framework OpenGL -framework GLUT -framework Foundation -o simple

Make sure that the three frameworks have been installed.