these 3 derivations will be built:
  /nix/store/ak6grplbivcf1ziz9klvhhgjnh5w1z4f-source.drv
  /nix/store/lnv37l7nmlgsvnk62xrbh2x4q6l1zj8h-harmonia-deps-3.2.0.drv
  /nix/store/ka2nx320cs8wfcjmj82xyqw64zdqwrs8-harmonia-3.2.0.drv