these 3 derivations will be built:
  /nix/store/craq28dk3hsphk7pv7m35ai8wal7bz61-notmuch-0.40.drv
  /nix/store/ka2grqc9rk5ymf34n90bgdm2ql63d9xq-rbw-1.15.0.drv
  /nix/store/563f7a2pji92c6zn8d214qwpbjvx1n9c-email-sync.drv