If you have read the previous posts about cross-compiling with gcc, you know that we need to install the cross-compiler first. This is not that difficult, but it has a few pitfalls. In particular, the one provided by ArchLinux by default does not work in our use case.

or: How I Learned to Stop Worrying and Love Ubuntu

PolKit is a standard authorization method for Linux. It usually consists of PolKit daemon, PolKit session agent and the helper program shipped by applications that use PolKit. As a user, you don’t really interact with PolKit itself, usually you interact with PolKit session agent. Like KDE’s PolKit agent: