these 6 derivations will be built:
  /nix/store/fqqgy4sk5iq17n4zi7ambr8qr9bx7p3w-Cargo.toml.drv
  /nix/store/rx6gkpx9j206c7bnvnhvg3yngynrycs6-Cargo.toml.drv
  /nix/store/z3j0sjmrhyzwx949ni6pbff96a29jwij-Cargo.toml.drv
  /nix/store/wa3j0imyg3g0bmqpdvzfyrx9y56wdyw9-source.drv
  /nix/store/kqn6wvwzzfxbyq51nvsp0h9r63r8zhbs-harmonia-deps-3.2.0.drv
  /nix/store/03am93hvpnvpqn5xdkgq9jixc5k0k2mr-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: wa3j0imyg3g0bmqpdvzfyrx9y56wdyw9-source.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: kqn6wvwzzfxbyq51nvsp0h9r63r8zhbs-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: 03am93hvpnvpqn5xdkgq9jixc5k0k2mr-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], [])