these 3 derivations will be built:
  /nix/store/6q650lj2si0mm0wiqyhgxc80bpks728r-src.drv
  /nix/store/jcm1jxal9spg561kaf23ymjfx606vv52-nix-uci-0.0.1.drv
  /nix/store/69l2qp6738bg8mm3znrxn0i11qn27h8s-uci-commands.drv