Hi, As said by Stas, you will have a clue on what is wrong going to *slime-events* buffer. To switch to that buffer just hit C-x b and select it -usually with right -> . Or by displaying the list of buffers by hitting C-x C-b and RET on it [1] 2. If unsuccessful you also can change to sbcl. I've got good experience with sbcl on arm (my case, on raspberry-py) check your repository otherwise & reset your emacs accordingly, e.g.: (setq inferior-lisp-program "sbcl") [1] http://www.gnu.org/software/emacs/manual/html_node/emacs/Select-Buffer.html#... good luck Syl