Sorry, I wasn't very clear with my original questions. My question had more to do with why namcap wasn't already in the KaOS repo than about building a package for it.
Namcap seems to be a very common application on distributions with pacman. I was surprised that it wasn't available in the KaOS repo. So my first thought was "maybe it's not compatible." Can namcap be used on KaOS packages? Has anyone tried it on KaOS? Is it not very useful for packaging or have you found a better alternative?