/usr/lib/ilisp/mzscheme-ilisp.scm is in ilisp 5.12.0+cvs.2004.12.26-18.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ilisp/../../share/ilisp/mzscheme-ilisp.scm
/usr/lib/ilisp/../../share/ilisp/mzscheme-ilisp.scm