I have two (nearly) identical machines, both running ~amd64 Gentoo up-
to-date and with a (nearly) identical set of installed packages.
Still, on one of these machines KDE crashes with that infamous polkit-
kde-authentication-agent-1 segmentation fault.
On the other machine there is no problem.
How can one smartly compare two Gentoo installations.
Currently I would have to produce an md5sum of all files in
/etc /usr /var and / and compare these. But there are dozens of
thousands of files in these directories.