1. Cut apricot halves in quarters and put into a 1 1/2-quart baking dish. Combine sugar, 2 tablespoons flour, cinnamon, and mace. Sprinkle over apricots and mix lightly. Set aside.
2. Combine oats, 1/2 cup flour, and brown sugar. Using a pastry blender or two knives, cut in the butter until mixture is crumbly. Spoon mixture evenly over apricots.
3. Bake at 350°F 45 minutes, or until mixture is bubbly and top is lightly browned.