I am currently working through the Land of Lisp examples and have run into a compile exception: package EXT does not exist
from this line I suspect:
(ext:shell (concatenate 'string "dot -Tpng -O" fname))
I am running my repl inside emacs with slime and am unsure as to how to remedy this after some googling of the error.
Any help would be much appreciated.
It was in fact that SBCL was set as the default lisp program in emacs.
(setq inferior-lisp-program "/usr/bin/sbcl")
(setq inferior-lisp-program "/usr/bin/clisp")
in my emacs configuration file fixed the issue. (On a Unix system at least)