There could be some way to remember users what installed packages need to be
reemerged after a new kernel is installed.

I thought in this ideas:

- Patch kernel's "make" to warn at the end of "make modules_install"
- Warn user after any boot (during init.d stage). This script should detect
the new kernel and warn users if some of the installed ebuilds need to be
reemerged.

What do you think?

Herbert