The following program compiles fine with Qt 6.4.1 but not with a recent dev branch:

#include <QtGlobal>

int main(int argc, char *argv[])
{
    qVersion();
}

On dev branch, it prints the error "error C3861: 'qVersion': identifier not found" and including qlibraryinfo.h instead fixes it. Our documentation also says to include QtGlobal for qVersion: https://doc.qt.io/qt-6/qtglobal.html