these 3 derivations will be built:
  /nix/store/z66hl2bmvby8mw2q2k5mszql75lfr34n-source.drv
  /nix/store/hsalpkvnf3n9l1pikllfh8qpblypwaj3-harmonia-deps-3.3.0.drv
  /nix/store/blcg71bmvg97qgcldqdh6fvfwxc0ijxr-harmonia-3.3.0.drv