Not sure about Qt 5.10, but Qt 5.12 have support for arm64-v8a target. You will need to build two APK files, one for armeabi-v7a, and one for arm64-v8a, with different versionCode values in manifest, and then just publish both in the same release.
Could anyone help me out with this in case I succeed retrieving the sourcecode?
While it requires some expertise it's not a huge task if there's no need to change the source code. I'm sure you can find someone on here or stackoverflow to do it for a tenner or so
@SGaist
Ah right - "configure" is ambiguous due to the two step configuration, once by the configure script for qtbase and once by the qmake for the other modules.
This is not so obviously that the summary of the configure script does not warn about disabled features in submodules due to missing dependencies.