these 2 derivations will be built:
  /nix/store/80vpxchrsrim3wq41c0dzs56s8xsyq82-ZCode-3.10.2-linux-x64.deb.drv
  /nix/store/dyg31m2jjva8g13zfyrpm0vqpba56kl8-zcode-3.10.2.drv