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Description of Issue: When you have a solution referencing multiple platforms (like Android, iOS, and Windows Phone) the Mac Build Host error shouldn't appear. It is confusing from a user's perspective and gives the perception that something is wrong, even though it isn't (unless they are targeting iOS).
I have checked this issue and I am getting the same behavior
When I create xamarin.Forms application on VS I observed that I am getting the same error while my Startup project is Android or Windows not iOS.
Microsoft Visual Studio Professional 2013
Version 12.0.30501.00 Update 2
Microsoft .NET Framework
Installed Version: Professional
Xamarin 22.214.171.124 (2c7ce396ab0b65e4a494d3055402ed5b33912ce2)
With implementation of XMA this shouldn't be reproducible, please verify with latest master build or alpha.