these 2 derivations will be built:
  /nix/store/lmfqpnr1wcwsgilnqx9yva2j3g7dzhpr-ZCode-3.10.1-linux-x64.deb.drv
  /nix/store/vkxivwa6js0xsds3rf279prv8j1jwida-zcode-3.10.1.drv