I'm fairly new to sfml and opengl. I'm stuck with creating vbo and vao with glGenBuffers(). Those functions are undefined until I include glew.h. I read that Sfml include glew by itself and it is not recommended to include it second time. I tried both ways - it is either undefined or linking errors. All examples I found use glBegin, glEnd blocks. Can someone point me at the right direction where I can learn about creating vbo, vao, shaders with Sfml? thank you.