these 3 derivations will be built:
  /nix/store/w81lczg2qmlws481xaw80qhjxaw7bxay-source.drv
  /nix/store/0m912i86xlnkc22w6syrplj9mcqh6ds7-harmonia-deps-3.2.0.drv
  /nix/store/0sjgbjvba3h2cw6s9a829v4cdzg0g9qs-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: 0m912i86xlnkc22w6syrplj9mcqh6ds7-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: 0sjgbjvba3h2cw6s9a829v4cdzg0g9qs-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], [])