Error sane-backends # derivation .drv requires non-existent output 'out' from input derivation

 - system: `"x86_64-linux"` 
 - nixos "cf63ade6f74bbc9d2a017290f1b2e33e8fbfa70a"

nixos-rebuild build

error: derivation '/nix/store/11l19zqbvwh41y61hrn7kbqz0b8valp8-hwdb.bin.drv' requires non-existent output 'out' from input derivation '/nix/store/p2al0d9ggxp8v1gi2zpp33mjacp078xd-sane-backends-1.0.32.drv'

How to add out ?

This happens when you do what exactly?

I remember that there was a bug in nix-env that caused a message like that, though that has been long fixed…

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