these 2 derivations will be built:
  /nix/store/8m8jh8hkpgiwwnz3ldr9dcsmdq023czv-zcode-3.15.3.drv
  /nix/store/8dldlxs2jcrkp9fmwa6s6b3wyk1vh6hh-check-zcode.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy