We are creating a new iOS project. I want to use the Universal API so pretty sure I need to switch to Xamarin Beta channel and pull the prerelease of MVVMCross.

However when I try and add the MVVMCross package to a fresh PCL I get 

> 
> Could not install package 'MvvmCross.PortableSupport 3.5.0-beta1'. You
>  are trying to install this package into a project that targets
>  'portable-net45+sl50+Xamarin.iOS10+MonoAndroid10+MonoTouch10', but the
>  package does not contain any assembly references or content files that
>  are compatible with that framework. For more information, contact the
>  package author.
> 
> 
> 

The error looks simple enough but those compatibility errors from NuGet are never as simple as they look

The PCL is targetting

* .NET 4.5
* Silverlight 5
* Xamarin Android
* Xamarin.iOS
* Xamarin.iOS (Classic)

Which targets do I need to change so I can add the correct MVVMCross to build Universal iOS