How did you try getting mcclim? Did you use quicklisp ?
Viewing post in NicCLIM - Map Editor jam comments
i did this...
ecl ECL (Embeddable Common-Lisp) 16.1.3 (git:UNKNOWN) > (load "~/quicklisp/setup.lisp") > (ql:quickload "mcclim") To load "mcclim": Load 1 ASDF system: mcclim ; Loading "mcclim" . ;;; Internal error: ;;; ** Cannot find the external symbol COMPARE-AND-SWAP in #<"MP" package>. Condition of type: COMPILE-FILE-ERROR