Dear Maintainer,

during upgrade to emacs 30 (1:30.1+1-1) warnings like this appear:

   bookmode.el:1:1: Warning: file has no ‘lexical-binding’ directive on its
first line

This warning appears for all el files in directory
`/usr/share/emacs/site-lisp/maxima/`. Should this be fixed by adding such directive?

Regards,
Jörg.