these 2 derivations will be built:
  /nix/store/0js79c2x34jzf71077glxaibz2gz2d9x-eca-native-linux-amd64.zip.drv
  /nix/store/nf4rlv5cybyh1qb3ypraa6qx39k89dfh-eca-0.160.3.drv