我找不到文件夹C:\Program Files (x86)\Microsoft Visual Studio 14.0 \ VC \包括\ gl在我的笔记本电脑。如何添加它?

Also does that mean opengl is not installed by default because I did check all the boxes when I installed visual studio community 2015. I couldn't find any clear answer anywhere. I'm supposed to add glut and glew header files to the aforementioned folder where gl.h and glu.h should already be there. But I couldnt find the folder include\gl itself. Also does that mean opengl is not installed by