Place neck bone, giblets, celery and onion in a saucepan with 2 cups of water. Let simmer 1 ½ hours. Strain and retain liquid, discarding vegetables and giblets, set aside. Heat turkey pan drippings in a sauté pan over medium heat, add a little of the liquid and the flour and whisk for 3-5 minutes until flour is browned (this eliminates the raw flour taste). Stir in the wine (or leftover maple glaze) and a little more of the giblet liquid until the consistency is smooth and thick. Adjust seasonings and serve with Smashed Potatoes, Southern Sausage Dressing and turkey.