Xamarin.Forms-Samples/Xamarin.Forms-Behaviors/Xamarin Behaviors/packages/repositories.config

<?xml version="1.0" encoding="utf-8"?>
<repositories>
  <repository path="..\Xamarin Behaviors\Xamarin_Behaviors.Android\packages.config" />
  <repository path="..\Xamarin Behaviors\Xamarin_Behaviors.iOS\packages.config" />
  <repository path="..\Xamarin Behaviors\Xamarin_Behaviors.WinPhone\packages.config" />
  <repository path="..\Xamarin Behaviors\Xamarin_Behaviors\packages.config" />
</repositories>