Jolla do not plan to move from Qt5.6 (https://forum.sailfishos.org/t/what-version-of-qt-are-we-on/4964/3) and we have switch from this version since 1.0.

GCompris is actually 5.12 minimum and we will "soon" be looking to be Qt6 so there is no need to keep a version that does not compile anymore.