Thanks for your extensive reply, @matt.mccormick!
Thanks for offering, @blowekamp .Indeed, the recent compilation errors I get from elastix are related to your work on Add streaming base classes and streaming statistics by blowekamp · Pull Request #855 · InsightSoftwareConsortium/ITK · GitHub One of the issues is that some elastix classes now need to override GetRadius(). I really have to dive into those classes to figure out how to properly implement such a GetRadius(). I’ll have a closer look tomorrow…