these 3 derivations will be built:
  /nix/store/k70qwc2fcf82pdq5pkp550ry1vlinqlk-source.drv
  /nix/store/zjqm55np05rs01zha1fa1j0jgq9gmq2j-source.drv
  /nix/store/6sxah99r0cyha7zj393p11pdvfrw3qlh-quakejs.drv