Native linking failed Xamarin.ios

I am trying to run the iOS example from https://components.xamarin.com/view/emgucv-v3
I am getting a lot of errors with Native linking failed. Is there a setting or something that I am missing?
Error:
Severity Code Description Project File Line Suppression State
Error Native linking failed, undefined symbol: _cvInputArrayFromVectorOfTriangle2DF. This symbol was referenced by the managed member Emgu.CV.Util.VectorOfTriangle2DF.cvInputArrayFromVectorOfTriangle2DF. Please verify that all the necessary frameworks have been referenced and native libraries linked. Emgu.CV.Example.iOS C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets 747