this derivation will be built:
  /nix/store/pyl15sykk0ai3zn62qyl74iq0f09jfiq-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/pyl15sykk0ai3zn62qyl74iq0f09jfiq-bcachefs-module-7.0.0-39-generic.drv'...