Flake utils as most people use it is often useless if not dangerous (leading users into errors you’ll now get bug reports for). To write a for loop over systems is 1–5 lines of Nix code instead of pulling in a dependency & it’s subdependencies. If you’re not testing systems, it might also not be wise to use defaultSystems & assuming it just works; often you are better served just picking the architectures you can test, or at least doing a union of the buildInputs’s support matrix.
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