I have a Debian 8 installed with its GCC4.8, and need to install GCC6, too.
Using Synaptic, if I select GCC6 from the list of installable packages, I get a message of this kind:
Mark additional required changes? To be removed: clang g++ g++4.9 gnome part of kde libreoffice ...
Of course there must be something wrong in what I did. How can I simply install a new compiler without all these side effects?