this derivation will be built:
  /nix/store/lkwf8hgqc4z0r2pvg04y80a9vx9p3lka-check-clauth.drv
building '/nix/store/lkwf8hgqc4z0r2pvg04y80a9vx9p3lka-check-clauth.drv'

upload niks3: ok