these 3 derivations will be built:
  /nix/store/a5pq5n2bzkv92qap1s0a5kcmbd66g8q5-source.drv
  /nix/store/az9qwhq0bvhdwrwqr620l06sdnrd9d3z-harmonia-deps-3.2.0.drv
  /nix/store/a87zvzsbldlhv105h74cv4l49dfw5rbr-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: az9qwhq0bvhdwrwqr620l06sdnrd9d3z-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: a87zvzsbldlhv105h74cv4l49dfw5rbr-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], [])