these 3 derivations will be built:
  /nix/store/v3kmx5ny5rdaygh70lhl2s123pqmg2x3-source.drv
  /nix/store/vq8hd8fikqimjvmkjy3xw007xrpj0gn1-harmonia-deps-3.3.0.drv
  /nix/store/rrbdmd8gpggcaacazrii63w5bwq7bw9r-harmonia-3.3.0.drv