anchor.diff:     swap-interval
      extension-supported-p
      get-proc-address))
  +
  +(define-foreign-library (glfw)
  +     (t (:default "libglfw")))
  +
  +(use-foreign-library glfw)
   
   ;;;; ## GLFW Types
   (defcenum (key-action)
  
positive.code:    wait-events
     get-input-mode
     set-input-mode
     key-action
     get-mouse-button
     get-cursor-position
     set-cursor-position
  
negative.code:   (:menu 348)
    (:last 348))
  
  (defbitfield (mod-keys)
    :shift
    :control
    :alt
    :super)
  
  (defcenum (mouse)
    (:1 0)
  