these 3 derivations will be built:
  /nix/store/ykafh6bdrz30pi740xfkhrgwkwlxhlcv-source.drv
  /nix/store/x72gw37bkgkpfqn30q3zk669w2y71n6m-harmonia-deps-3.2.0.drv
  /nix/store/28b2hnmicr51khkv7nnqnp1i37d8jv9b-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: x72gw37bkgkpfqn30q3zk669w2y71n6m-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: 28b2hnmicr51khkv7nnqnp1i37d8jv9b-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], [])