these 2 derivations will be built:
  /nix/store/yyc778da1ajiclblpq1k9rw93wyc07sc-nix-grpc-store-0.2.2.drv
  /nix/store/9wkxz7q4a16szzz8yqhl6710dyyf2n56-nix-grpc-store-dispatcher.drv