these 4 derivations will be built:
  /nix/store/dpijv97jmf0zqzcr7xxs2m5dmnyvck0g-Cargo.toml.drv
  /nix/store/19rgdrzw9irfnrdnb257k2lssx5z687g-source.drv
  /nix/store/h295pjwr8sv8fipbr2qvr2gkc5djqn2w-harmonia-deps-3.2.0.drv
  /nix/store/zbp1p626j509ibaj27k8b900k6wgahd9-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: h295pjwr8sv8fipbr2qvr2gkc5djqn2w-harmonia-deps-3.2.0.drv
required (system, features): (aarch64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])
Failed to find a machine for remote build!
derivation: zbp1p626j509ibaj27k8b900k6wgahd9-harmonia-llvm-cov-3.2.0.drv
required (system, features): (aarch64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])