these 4 derivations will be built:
  /nix/store/3ghplnp3gfkgf2bm2l1mknl0lfw00cs6-Cargo.toml.drv
  /nix/store/9qx8w83yjlsgvis7qibjl7yqdqdgx2zk-source.drv
  /nix/store/852zr9vbl9ds93w14q3qba85xyv2pq1d-harmonia-deps-3.2.0.drv
  /nix/store/khpaqfqd0rwm4xh9v3p4zd0ypws4h9vx-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: 852zr9vbl9ds93w14q3qba85xyv2pq1d-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: khpaqfqd0rwm4xh9v3p4zd0ypws4h9vx-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], [])