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These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.
Add on top of default.nix: with import {};
or simply run as nix-build ''
(i. e. for nix-build complaining) or rather nix-build -E 'with import {}; callPackage ./default.nix {}'
(or even import)