Due to xz being override in the last stdenv and also in the previous, the nixpkgs xz ended up being built by bootstrap-tools, and thus depending on it through libgcc_so.so.1. That ends up making 'nix' with a runtime dependency on bootstrap-tools.
Due to xz being override in the last stdenv and also in the previous, the nixpkgs xz ended up being built by bootstrap-tools, and thus depending on it through libgcc_so.so.1. That ends up making 'nix' with a runtime dependency on bootstrap-tools.