> 'unmerge'ing those you don't want will clean up portage's database of
> installed packages.  Doesn't remove /lib/modules/<kernel-version>/
> though or old kernels from /boot/.  Seems that manual deletion is
> required here.

That's because one may still want to use a compiled kernel after the removal 
of the kernel sources.

The second thing is that sys-kernel/gentoo-sources does only refer to the 
kernel sources and not to your self-made kernel. If the kernel were 
made/compiled by portage like any other program, portage would remove it. But 
unless this does not happen (and by the way is not possible yet), why should 
portage clean up the things it has not caused?

rgds
Bernhard


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