these 3 derivations will be built:
  /nix/store/8p2kj569nl7cxj9w540bbw6rf1qyway4-source.drv
  /nix/store/lzs3ilxia31x754nda6p3z2wmlrdrb9y-deja-vu-0.23.3.drv
  /nix/store/ydr5nl7ak1lc7z2yr7182ja1kyd5b6md-check-deja-vu.drv