these 2 derivations will be built:
  /nix/store/l9n2xs0016q48r8vwrs77c4d22nja456-harmonia-deps-3.1.0.drv
  /nix/store/n7xxj11z166ma4zgf7pvb67nk4bgxvyw-harmonia-llvm-cov-3.1.0.drv
Failed to find a machine for remote build!
derivation: l9n2xs0016q48r8vwrs77c4d22nja456-harmonia-deps-3.1.0.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: n7xxj11z166ma4zgf7pvb67nk4bgxvyw-harmonia-llvm-cov-3.1.0.drv
required (system, features): (aarch64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])