these 3 derivations will be built:
  /nix/store/qarb5j554v1646ha9zkwhkjk6485d6g8-source.drv
  /nix/store/drnp9gslbaifzgqsx2q9xas5341jn3c3-harmonia-deps-3.2.0.drv
  /nix/store/i4k4zg77630asx4c72irxaiy5vp8k2gg-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: drnp9gslbaifzgqsx2q9xas5341jn3c3-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: i4k4zg77630asx4c72irxaiy5vp8k2gg-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], [])