Thanks a lot, Mark. I'm working w/ a recently updated Git sandbox with some minor unrelated changes. I'm working on macOS, with ABCL 1.7.0 installed via Homebrew. I got to the reported state via these steps more or less: $ cd maxima-code # top level directory $ abcl (load "configure.lisp") (configure) ;; answer questions here (quit) $ cd src $ abcl (load "maxima-build.lisp") ;; use defsystem. ASDF fails, I didn't investigate (maxima-compile) (quit) $ abcl (load "maxima-build.lisp") ;; yeah, Maxima has a nutty build system. Oh well (maxima-load) (run) At this point you should have a Maxima prompt and you can issue :lisp (load "../share/odepack/load-dlsode.lisp") as shown before. ODEPACK is translated automatically from Fortran (via f2cl), so it is probably idiosyncratic Lisp, and might contain large functions. You made a login for me for Trac on abcl.org, but my login doesn't seem to be recognized (it wasn't then and it isn't now). Not a problem, I'm happy to just post this to the mailing list. Thanks for your help, Robert Dodier