GLU_NURBS_MODE



when I comiple a opengl program with g++(patched with mingw), it said
GLU_NURBS_MODE and GLU_NURBS_TESSELLATOR are not defined, while
GLU_OUTLINE_POLYGON and GLU_DISPLAY_MODE are ok. if I comment out
GLU_NURBS_MODE and GLU_NURBS_TESSELLATOR related code, the programe
can work normally, why? did I forget to include certain header files?
in my program the glut.h and windows.h are included.
.