On a PC, Xamarin Studio 5.8.3: New solution, Blank App (Xamarin.Forms Shared). Named it "GLTest1".
GLTest1.Droid > Packages > Update the existing packages (Xamarin.Android.Support.v4, Xamarin.Forms).
Packages > Add Packages > Officiel NuGet Gallery > OpenTK 1.1.1589.5942 7/18/2014
error message:
Could not install package 'OpenTK 1.1.1589.5942'. You are trying to install this package into a project that targets 'MonoAndroid,Version=v5.0', but the package does not contain any assembly references or content files that are compatible with that framework...
What do I need to do differently, so I can reference class "GL", for use in an OpenGLView?