My SpriterPlusPlusQt is now in a working state. You should now be able to build and run it.
Using it from QML is very easy.
I created an example that's more or less the same as the SFML one (creating 100 random entities). Each frame is 10ms, so performance is good.
Now I need to add more features (sound, ...) and optimize a bit.
Still a question, are there some dimensions on the animation as a whole I could use? A bounding box.
I've added a pull request for a gcc change and a fix for header files not found.
I could build the engine now with:
LANG=C g++ -std=c++14 -shared -fPIC -I. */*.cpp -o spriterengine.so
(LANG=C only because I like the terminal output in English)