this derivation will be built:
  /nix/store/fml1fdcnf2rplvpskxfygiwp0v7qxfyn-bcachefs-module-7.0.0-39-generic.drv
building '/nix/store/fml1fdcnf2rplvpskxfygiwp0v7qxfyn-bcachefs-module-7.0.0-39-generic.drv'...