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Well, the @krita devs seem to think that a generalised wallpaper function would be interesting. Let me see what I can do.

Whoa. Building was absolutely painless. I saw CMake files, did the usual thing, waited a few minutes, and WHOOP out popped a Krita.

Guess I can start reading its source code now.

OMG has the cutest build instructions. These are actually referenced from their official documentation as the canonical way to build it.

How to build Krita... for cats!

davidrevoy.com/article193/guid