anchor.diff:  
     linux_2_6_39_powertop = linux_2_6_39.override {
       extraConfig = ''
  -        CPU_FREQ_GOV_ONDEMAND y
  -        CPU_FREQ_STAT y
           DEBUG_KERNEL y
  -        HIGH_RES_TIMERS y
  -        HPET_TIMER y
  -        NO_HZ y
           PM_ADVANCED_DEBUG y
           PM_RUNTIME y
  -        SND_AC97_POWER_SAVE y
           TIMER_STATS y
           USB_SUSPEND y
       '';
  
positive.code: 
    linux_3_1_powertop = linux_3_1.override {
      extraConfig = ''
          CPU_FREQ_GOV_ONDEMAND y
          CPU_FREQ_STAT y
          DEBUG_KERNEL y
          HIGH_RES_TIMERS y
          HPET_TIMER y
          NO_HZ y
          PM_ADVANCED_DEBUG y
          PM_RUNTIME y
          SND_AC97_POWER_SAVE y
          TIMER_STATS y
          USB_SUSPEND y
      '';
  
negative.code: 
    linux_3_0_powertop = linux_3_0.override {
      extraConfig = ''
          DEBUG_KERNEL y
          PM_ADVANCED_DEBUG y
          PM_RUNTIME y
          TIMER_STATS y
          USB_SUSPEND y
      '';
  