Thank you cr1776. This makes it clear to me.

If I want to compile 0.14.2, lets say in some weeks, is it possible to just run the usual
./autogen.sh
./configure
make
sudo make install
or do I have to delete 0.14.1 before this procedure on my Linux System? So my question is how to "upgrade" the Core Client to a newer version.
I installed the Core only on fresh systems so far.