these 4 derivations will be built:
  /nix/store/bn6pcdaffsb6hhf2h89bvfjqgwmxgg0s-Cargo.toml.drv
  /nix/store/bs4dq6l33f3r5sllmf689925bhr5bfs0-source.drv
  /nix/store/41jfl2sr4723lrrjy5gfair7d55knlxi-harmonia-deps-3.2.0.drv
  /nix/store/jm3sx5qk7hyvda6bk8wmsy3m2scf4yrr-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: 41jfl2sr4723lrrjy5gfair7d55knlxi-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: jm3sx5qk7hyvda6bk8wmsy3m2scf4yrr-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], [])