On 2017-11-20 15:04, R.Wieser wrote:
> Hello all,
>
> Last week I obtained a RP3 (running LXPanel 0.9.3), and would now like to
> write my first linux-based dialog/window for it*, using C (or C++).


Here is a nice video of somebody creating a gtk+ hello world program in C.
https://www.youtube.com/watch?v=CIVZtyiFH7A

But you should definitely have a look at gtkmm, as this is the c++
interface to gtk.

There is even an example including compilation hints on wikipedia
https://en.wikipedia.org/wiki/Gtkmm

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