My package (emacs-vm) was one of the ones that broke with the upgrade
to Emacs 28 in F36. I'm trying to get it to work again.

One of the issues is that it shows up a large number of warnings.
After some time I've now understood this is because of the new native
compilation feature. Since my package doesn't include any *.eln files
and Emacs will do the compilation on first use, and put in the home
directory. The VM package has a lot of old code that triggers
warnings. Previously those have only shown up at build time, and I
have hoped for upstreams to some day fix them. Now they will also show
up at run time, which obviously is a more annoying user experience.