these 3 derivations will be built:
  /nix/store/lz078yx0ymd3i77027rbp8a9n4vpi1mk-source.drv
  /nix/store/kdjd1k9c4qbjn1qffd37pdy523d5w6jj-harmonia-deps-3.3.0.drv
  /nix/store/6nc60k132p99mlf39y4kqpf6i80cd950-harmonia-llvm-cov-3.3.0.drv
Failed to find a machine for remote build!
derivation: kdjd1k9c4qbjn1qffd37pdy523d5w6jj-harmonia-deps-3.3.0.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: 6nc60k132p99mlf39y4kqpf6i80cd950-harmonia-llvm-cov-3.3.0.drv
required (system, features): (aarch64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])