these 3 derivations will be built:
  /nix/store/9isy2ailny8w1mq8bqi9rf772116jlcm-source.drv
  /nix/store/chk9gjsn6v5i313masp55rc3n3hy72kk-tribuchet-deps-0.1.0.drv
  /nix/store/w6gdx3ryv0yv30rm8dlvypasb4avk33r-tribuchet-0.1.0.drv