I think you misunderstood what i wrote. I didn't write that Xt itself is using Athena, i wrote that the "Xt Intrinsics volume" (i.e. the book) uses Athena as t

I think you misunderstood what i wrote. I didn't write that Xt itself is using Athena, i wrote that the "Xt Intrinsics volume" (i.e. the book) uses Athena as the widget toolkit. Xt itself does not provide any widgets so you need some widgets to show what it does and the book uses Athena for that.