anchor.diff:      binaryCaches = [ https://cache.nixos.org https://hydra.nixos.org ];
       binaryCachePublicKeys = [ "hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs=" ];
   
  +    buildCores = 0;
  +
       extraOptions = ''
         auto-optimise-store = true
       '';
  
positive.code:   };
  
    environment.systemPackages = with pkgs; [
      atom
      binutils
      emacs
      gitFull
  
negative.code:     gc = {
        automatic = true;
        dates = "10:00";
        options = "--delete-older-than 30";
      };
  
      trustedBinaryCaches = [ https://cache.nixos.org https://hydra.nixos.org ];
  