these 3 derivations will be built:
  /nix/store/5winzqdvbj3b9zcnllaqz1kvlx7g8hnf-source.drv
  /nix/store/nsaprr1vipxg9kxagfsy1m60g7am9985-harmonia-deps-3.2.0.drv
  /nix/store/jsq6nn7x8fdkpqdwj63m6kcb54j9p72z-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: nsaprr1vipxg9kxagfsy1m60g7am9985-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: jsq6nn7x8fdkpqdwj63m6kcb54j9p72z-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], [])