Xamarin.Android on OSX, can't build

Hello,

I can't build my MonoGame-App for Android on OSX Mavericks. I think the compiler can't handle the extension methods.

The compiler shows many errors, as example GetDefaultConstructor... Extension Method requires CompilerServices.ExtensionAttribute...

I have testet it with a clean project, with only MonoGame added, but it doesn't worked for me.

I hope anyone could help. Thank you Ronny