Hi: Using chmod 1777 could help?
I attached a patch just in case it does. Cheers, -- JeremÃas
--- ilisp.postinst.orig 2012-08-21 16:39:21.911900568 -0300 +++ ilisp.postinst 2012-08-21 16:38:51.211748311 -0300 @@ -65,7 +65,7 @@ case "$1" in configure) set_keybindings - chmod 777 /usr/lib/ilisp # Required so that users can build .fasl files + chmod 1777 /usr/lib/ilisp # Required so that users can build .fasl files register-common-lisp-source ilisp ensure_symlinks ;;