anchor.diff:  
   (cffi:defcfun ("aiGetVersionRevision" ai-get-version-revision) :unsigned-int)
   
  +#-old-assimp
   (cffi:defcfun ("aiIdentityMatrix3" ai-identity-matrix-3) :void (mat :pointer))
   
  +#-old-assimp
   (cffi:defcfun ("aiIdentityMatrix4" ai-identity-matrix-4) :void (mat :pointer))
   
  +#-old-assimp
   (cffi:defcfun ("aiDetachAllLogStreams" ai-detach-all-log-streams) :void)
   
   (cffi::defctype ai-log-stream-callback :pointer)
  
positive.code:   (:ai-default-log-stream-stderr 4)
    (:ai-default-log-stream-debugger 8))
  
  (cffi:defcfun ("aiGetPredefinedLogStream" ai-get-predefined-log-stream)
      ai-log-stream
    (p-streams ai-default-log-stream)
  
negative.code:   (c :float)
    (d :float))
  
  #-old-assimp
  (cffi:defcfun ("aiTransformVecByMatrix3" ai-transform-vec-by-matrix-3) :void
    (vec :pointer)
    (mat :pointer))
  
  #-old-assimp
  (cffi:defcfun ("aiTransformVecByMatrix4" ai-transform-vec-by-matrix-4) :void
    (vec :pointer)
    (mat :pointer))
  
  #-old-assimp
  (cffi:defcfun ("aiDetachLogStream" ai-detach-log-stream) ai-return
    (stream :pointer))
  
  