Gnu Emacs doesn't seem to like references to copy-list: Symbol's function definition is void: copy-list Here are the offenders: ./slime.el: (slime-start* (plist-put (copy-list options) :init-function init)))) ./slime.el: (let ((table (sort* (copy-list slime-repl-shortcut-table) #'string< ./slime.el: (let ((new-note (copy-list (car notes)))) -- "You do not really understand something unless you can explain it to your grandmother." -- Albert Einstein.