This happens when building emulator for current Qt version in Quick Designer:

In file included from /Users/marco_piccolino_tb/tools/Qt/Qt Creator.app/Contents/Resources/qml/qmlpuppet/qml2puppet/instances/qt5nodeinstanceserver.cpp:26:
In file included from /Users/marco_piccolino_tb/tools/Qt/Qt Creator.app/Contents/Resources/qml/qmlpuppet/qml2puppet/instances/qt5nodeinstanceserver.h:30:
/Users/marco_piccolino_tb/tools/Qt/Qt Creator.app/Contents/Resources/qml/qmlpuppet/qml2puppet/instances/nodeinstanceserver.h:82:21: error: no member named 'make_unique' in namespace 'std'
{{ return std::make_unique<MultiLanguage::Translator>();}}
{{ ~~~~~^}}
/Users/marco_piccolino_tb/tools/Qt/Qt Creator.app/Contents/Resources/qml/qmlpuppet/qml2puppet/instances/nodeinstanceserver.h:82:58: error: expected '(' for function-style cast or type construction
{{ return std::make_unique<MultiLanguage::Translator>();}}
{{ ~~~~~~~~~~~~~~~~~~~~~~~~~^}}
/Users/marco_piccolino_tb/tools/Qt/Qt Creator.app/Contents/Resources/qml/qmlpuppet/qml2puppet/instances/nodeinstanceserver.h:82:60: error: expected expression
{{ return std::make_unique<MultiLanguage::Translator>();}}
{{ ^}}
3 errors generated.
make: *** [qt5nodeinstanceserver.o] Error 1