Remove all but 3 tablespoons of the fat from the turkey roasting pan, retaining the pan drippings or fond in the pan. Place the pan over a burner and add the broth. Heat to a boil while stirring to release the fond from the bottom of the pan. While whisking, slowly add the flour to thicken the gravy. Cook for about 3-5 minutes. If it is not thick enough for you, whisk in more flour. Season with the salt and pepper and serve hot.