
This applies [hydra PR #432](https://github.com/NixOS/hydra/pull/432) to the NixOS module in nixpkgs: ``` commit 4efd078977e5ea20e1104783efc324cba11690bc Author: Bas van Dijk <v.dijk.bas@gmail.com> Date: Sun Dec 11 15:35:38 2016 +0100 Only set buildMachinesFiles when nix.buildMachines is defined ```
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.