[slime-devel] Implementation Specific Configuration

Hi, How can set local environment variables in slime-mode specific to each lisp implementation? I tried to use something similar to below code snippet. (defun custom-slime-mode () (interactive) ... ;; Implementation specific symbol completion. (setq slime-complete-symbol-function (case slime-lisp-implementation-name ((x y z) 'slime-simple-complete-symbol) (t 'slime-fuzzy-complete-symbol)))) (add-to-list 'slime-mode-hook 'custom-slime-mode) But emacs complains that (void-variable slime-lisp-implementation-name) How do you define implementation specific local environment variables? Regards.