Build system wipes include directory

Dear List,

I am experimenting with genode and till now it went pretty good. I was building my project and had to rebuilt it a couple of times and suddenly the built broke.

I thought no problem, thus I did a make clean. This wasn't helpful. Then I did a make cleanall, but now it wiped out the whole build/include directory.

Is this intended behaviour or should I not put things there? At this stage it is just annoying, but I think this is a bug, because the tutorial puts the headers, which define the RPC interfaces. Can I prevent this behaviour?

And I want to use c++ features like Strings instead of char *. How can I enable this? I recognize I need a library for this, but I can't find it in base.

Thanks for your help!

Greets,

Edgar Klerks