`eval-system` option overrides just the value of `builtins.currentSystem`. This is more useful than overriding `system` since you can build these derivations on remote builders which can work on the given system. Co-authored-by: John Ericson <John.Ericson@Obsidian.Systems> Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>