opengl vector freeing

I am fooling around with the opengl libraries.[+]

A comment in vectors.lisp makes me wonder whether I need to explicitly free 
opengl vectors or whether this happens automagically.  Opengl::free-gl-vector 
is not exported from the package.

Does anybody know the correct answer?

pt

[+] In the process, I am converting some of the tutorials at 
http://nehe.gamedev.net/ to LW.  If anyone wants the code, just ask.