Hi, > +                ;; The jlibrary/dev directory only sometimes exists, > but needs > +                ;; to be copied into the ~system directory when it > does. > +                (for-each > +                  (lambda (dev-dir) > +                    (if (access? dev-dir R_OK) > +                      (copy-recursively dev-dir > "test/bin/system/dev"))) Are you testing for file permissions, or for the existence of the file? If the latter, I'd recommend using 'file-exists?' instead. > +                  (if (access? source-dev R_OK) Likewise. Greetings, Maxime.