[doubt] Do I need glew?

[leoneves]

Hello, I'm studying opengl and I'm trying some things with lisp.
For my surprise I need only the cl-opengl and glfw for doing things in lisp.
But I have learned that each implementation of opengl can be different for each graphic device. So we need some library like glew to be sure of versions and implementations of real calls to a graphic device.
Am I right about that?
is it ok make things in openGl by lisp bindings without glew(or other way to do its work)?

thanks in advance.