Backend swapRow errors

[jcpconecomp]

Getting started on Ubuntu 20.04, go version go1.14.4. I have Qt 5.9, 5.13.0(under therecipe), 5.14.2 and 5.15.0 installed. The 2 simpler examples build and run fine using the -p linux option. However any example with the Backend yield errors like this:
listmodel.cpp: In member function ‘void QamelListModel::swapRow(int, int)’:
listmodel.cpp:143:24: warning: ‘void QList::swap(int, int) [with T = QVariant]’ is deprecated: Use QList::swapItemsAt() [-Wdeprecated-declarations]
143 | _contents.swap(i, j);
for listmodel and tablemodel (though neither is used in the example) when 5.13 and above are used and a different error for 5.9.
Does anyone have any suggestions

[muesli]

These aren't actually errors, but deprecation warnings.