anchor.diff:  
           restartTriggers = [ nixConf ];
         };
  +
  +    systemd.tmpfiles.rules = [ "d ${cfg.buildLocation} 0775 root root -" ];
   
       # Set up the environment variables for running Nix.
       environment.sessionVariables = cfg.envVars //
  
positive.code:         '';
        };
  
      };
  
    };
  
negative.code:           ++ optionals cfg.distributedBuilds [ pkgs.gzip ];
  
          environment = cfg.envVars
            // { CURL_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt";
                 TMPDIR = cfg.buildLocation;
               }
            // config.networking.proxy.envVars;
  
          unitConfig.RequiresMountsFor = "/nix/store";
  