this derivation will be built:
  /nix/store/r2cap8lwrm8scx4j8i1w0apss99y8sc9-bcachefs-module-7.2.8-arch1-2.drv
building '/nix/store/r2cap8lwrm8scx4j8i1w0apss99y8sc9-bcachefs-module-7.2.8-arch1-2.drv'...