anchor.diff:      # will add a fixed value of 10 °C the 3rd value read from that file. Check out
       # http://www.thinkwiki.org/wiki/Thermal_Sensors to find out how much you may
       # want to add to certain temperatures.
  -    
   
       ${cfg.fan}
       ${cfg.sensors}
  
positive.code:     services.thinkfan = {
  
        enable = mkOption {
          default = false;
          description = ''
            Whether to enable thinkfan, fan controller for IBM/Lenovo ThinkPads.
  
negative.code:             S.M.A.R.T. (since 0.9 and requires the USE_ATASMART compilation flag)
                Which reads the temperature directly from the hard
                disk using libatasmart (keyword atasmart)
  
            Multiple sensors may be added, in which case they will be
            numbered in their order of appearance.
          '';
        };
  
        fan = mkOption {
          type = types.str;
          default = "tp_fan /proc/acpi/ibm/fan";
          description =''
            Specifies the fan we want to use.
            On anything other than a Thinkpad you'll probably
            use some PWM control file in /sys/class/hwmon.
            A sysfs fan would be specified like this:
              pwm_fan /sys/class/hwmon/hwmon2/device/pwm1
          '';
        };
  
        levels = mkOption {
          type = types.lines;
          default = ''
            (0,     0,      55)
            (1,     48,     60)
  