Coconut Pecan Frosting Mix Substitute

1 cup coconut
3/4 cup brown sugar, firmly packed
1/2 cup flour
1/2 cup chopped pecans
3 tablespoons butter or margarine

In medium bowl, combine coconut, brown sugar, flour, and pecans; mix well.

Using fork or pastry blender cut in butter or margarine.

Source: Pillsbury Bake-Off Cookbook; March, 1995

In reply to:

I have an old recipe for a delicious zucchini cake but one of the ingredients, dry boxed coconut pecan frosting mix, is no longer available. I'd really like to make it again but I am afraid of altering the taste without the dry frosting mix. Any ideas what I can use in place of this discontinued ingredient?
Thank you!
Diana