ConsoleTraceListener missing in Mono System.Diagnostics?

Question

I am trying to add standard ConsoleTraceListener(in System.Diagnostics) as shown below in Xamarin.iOS:

Trace.Listeners.Add(new ConsoleTraceListener()); 

I see this class defined in Github in the documentation , but it is missing in the browser builder in Xamarin Studio. My project is referenced in System.dllv2.0.5.0.

In fact, only TraceListenerand are defined DefaultTraceListener. Why is he missing and how can I fix it?