include\GLee.h(40): fatal error C1189: #error : gl.h included before glee.h解决方法

include\GLee.h(40): fatal error C1189: #error : gl.h included before glee.h
include\GLee.h(40): fatal error C1189: #error :  gl.h included before glee.h解决方法
include\GLee.h(40): fatal error C1189: #error :  gl.h included before glee.h解决方法
include\GLee.h(40): fatal error C1189: #error :  gl.h included before glee.h解决方法
include\GLee.h(40): fatal error C1189: #error :  gl.h included before glee.h

问题说gl.h不能include在glee.h前面
但是gl.h没有在glee.h前面啊,是我理解错了吗?求解,到底是怎么回事?
glee.h的头文件里面有window.h和gl.h

------解决思路----------------------
应该是说要想include glee.h,得先include gl.h