these 4 derivations will be built:
  /nix/store/291v843v3g4pn3hviwy2pzrz2swfbfx0-Cargo.toml.drv
  /nix/store/lkvwhmzq8kdig8mc9wpmrgy0ylmq5h26-source.drv
  /nix/store/jwv721p0jv73yfzz3a5q64wz6vkj92sw-harmonia-deps-3.2.0.drv
  /nix/store/sii1sd7452csglfm8ba8rnv2ra5vj0hj-harmonia-llvm-cov-3.2.0.drv
Failed to find a machine for remote build!
derivation: jwv721p0jv73yfzz3a5q64wz6vkj92sw-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: sii1sd7452csglfm8ba8rnv2ra5vj0hj-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], [])