Hi, on my machine I get this: CL-USER> (ql:quickload :cl-opengl) To load "cl-opengl": Load 1 ASDF system: cl-opengl ; Loading "cl-opengl" .... (:CL-OPENGL) CL-USER> (in-package :cl-opengl) #<PACKAGE "CL-OPENGL"> GL> (get-string :vendor) NIL GL> (get-string :renderer) NIL GL> (get-string :version) NIL GL> (get-string :shading-language-version) NIL GL> (get-string :extensions) NIL This is cl-opengl-20191130-git on arch linux with sbcl 2.0.1. I use the mesa libs. Is my setup incomplete or am I doing something wrong? All in all cl-opengl seems to work well here (except for get-string). Let me know if you need more information. -- Orm