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This is a fix for https://discourse.nixos.org/t/why-do-darwin-build-derivations-end-up-on-a-nixos-system/2416/2.
Without this patch running the following on MacOS:
results in the following error during the configuration phase (note that Nix should be configured with a x86_64-linux build machine):
This problem is that the
nix
dependency of hydra is selected from a nixpkgs set configured with a defaultsystem
parameter, i.e.builtin.currentSystem
. This means that the hydra derivation which isbuild for and on Linux depends on the nix derivation build for Darwin.
The fix is to select nix from the nixpkgs set configured with a system specified by the user.