I have found that to build this component, I need to add -framework QuartzCore to iOS build options. I did this for every configuration other than simulator.
Hope this helps both users and Xamarin -- presumably you can fix this at your end.
Also worth noting -- depending on what frameworks your project uses, it is possible that your project may need to link additional frameworks.
Further update. The above worked in debug mode. But App Review are reporting that they don't see ads in the distribution build.
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