PeterO,
You have been using Linux a little longer than me. You know how these things go. If the thing you want has been packaged for your distro it may work out of the box. If not you have to put some effort in. Sometimes a lot of effort. And sometimes failing and giving up.
You have caught me out there. I have never installed the packages from twolife. However others have reported success with them on this forum.
It may possibly help if you were to say what failed and how. Any error messages to look at?
Yep , I can point you at a solution that works. Last January I compiled Qt5.2 from source. You can fetch a tar ball of the resulting build from my dropbox
https://www.dropbox.com/s/6cfrtziveaj25 ... i.tgz?dl=0 This has been reported as working by others. It also supports running Qt apps without X. Full screen with accelerated opengl/GLES what ever they call it.
Except. I was loath to suggest this route because a) It's a year old and b) You probably need to know how to configure Qt a bit. I don't recall the steps and sadly the blog where I posted the instructions is not up just now. I'll see what I can do about that.
Oh, and c) There is no qtcreator in there. I do all that on my PC because the old Pi was a bit slow about it. If I need to hack code on the Pi there is always vim.
Good luck. Let's hear how you get along.
Memory in C++ is a leaky abstraction .