Thanks Uwe - I was afraid that was the case...

But do you have any idea how to configure Qt to build Qt5Svg.dll from source automatically? I'm completely at a loss, and questions that I've placed about this in Qt Project and QtCentre over the past few days have so far gone unanswered, as have other people's questions on the same subject.

So far I'm stuck on this and unable to build Qwt with the configuration I'd like.