Xamarin Studio 5.2, Mac OS X Mavericks.
From Package Console:
Adding CocosSharp.PCL.Shared.MacOS...
Installing 'CocosSharp.PCL.Shared.MacOS 1.0.0.0'.
Added file 'CocosSharp.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/portable-net40+sl50+win8+wp8+MonoAndroid10+MonoTouch10'.
Added file 'CocosSharp.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoAndroid10'.
Added file 'ICSharpCode.SharpZipLib.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoAndroid10'.
Added file 'Lidgren.Network.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoAndroid10'.
Added file 'MonoGame.Framework.Net.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoAndroid10'.
Added file 'MonoGame.Framework.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoAndroid10'.
Added file 'box2d.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoAndroid10'.
Added file 'CocosSharp.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoTouch10'.
Added file 'ICSharpCode.SharpZipLib.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoTouch10'.
Added file 'Lidgren.Network.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoTouch10'.
Added file 'MonoGame.Framework.Net.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoTouch10'.
Added file 'MonoGame.Framework.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoTouch10'.
Added file 'box2d.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/MonoTouch10'.
Added file 'ChipmunkSharp.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'CocosSharp.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'ICSharpCode.SharpZipLib.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'Lidgren.Network.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'MonoGame.Framework.Net.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'MonoGame.Framework.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'Tao.Sdl.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'box2d.dll' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0/lib/net40'.
Added file 'CocosSharp.PCL.Shared.MacOS.1.0.0.0.nupkg' to folder 'CocosSharp.PCL.Shared.MacOS.1.0.0.0'.
Successfully installed 'CocosSharp.PCL.Shared.MacOS 1.0.0.0'.
Adding 'CocosSharp.PCL.Shared.MacOS 1.0.0.0' to AngryNinjas.
For adding package 'CocosSharp.PCL.Shared.MacOS 1.0.0.0' to project 'AngryNinjas' that targets 'net40',
>> Assembly references are being added from 'lib/net40'
Added reference 'ChipmunkSharp' to project 'AngryNinjas'.
Added reference 'CocosSharp' to project 'AngryNinjas'.
Added reference 'ICSharpCode.SharpZipLib' to project 'AngryNinjas'.
Added reference 'Lidgren.Network' to project 'AngryNinjas'.
Added reference 'MonoGame.Framework.Net' to project 'AngryNinjas'.
Added reference 'MonoGame.Framework' to project 'AngryNinjas'.
Added reference 'Tao.Sdl' to project 'AngryNinjas'.
Added reference 'box2d' to project 'AngryNinjas'.
Added file 'packages.config'.
An exception was thrown while dispatching a method call in the UI thread.
Xamarin Studio 5.2, Mac OS X Mavericks.
From Package Console: