If you try to compile https://github.com/kjeremy/MvxAndroid.Support.V7 in Xamarin Studio on OSX it will fail because MvxRecyclerView.Adapter hides RecyclerView.Adapter and treats that as an error even with the "Treat warnings as errors checkbox off".
It succeeds with Visual Studio 2013 (though there is a warning).
The build also succeeds with Xamarin Studio on a Windows 7 PC.
I do have an issue on OSX.
Fixed in master and Mono 4.0