@montel Hi (sorry to be the messenger once more :) )
Sadly it does not compile fine with current minimal required AccountsQt5 versions as e.g. currently available on FreeBSD CI, cmp. https://build.kde.org/view/Failing/job/Applications/job/kaccounts-integration/job/kf5-qt5%20FreeBSDQt5.13/28/

This would need a bump of set(ACCOUNTSQT_DEP_VERSION "1.13") to some version where QString::null & Co is removed I guess.

Okay, seems somebody else was not just messenger,but also fixer, by D25142 in parallel :) So solved then while I was typing, and meanwhile CI also looks good.