Binding Objc libs problem

Trying to bind with Objc libs on Xamarin.Mac, I obtain this error.

"... Error CS0246: The type or namespace name `BaseType' could not be found. Are you missing an assembly reference?..."

1 - do the same binding system of MonoTouch is implemented on Xamarin.Mac? 2 - If yes, why doesn't exist a template project to create a binding library?

Thanks for answers.