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Extra underscore in .h file guard

H A

I have been looking at some examples from NXP and they have the following convention with an extra _ in the #ifndef in all their .h files:

#ifndef DRIVER_CONFIG_H_
#define DRIVER_CONFIG_H

#include <LPC11xx.h>

#define CONFIG_ENABLE_DRIVER_CRP                                                1
#define CONFIG_CRP_SETTING_NO_CRP                                               1

 /* DRIVER_CONFIG_H_ */
#endif

How does this work? Tried to google it and did not find much but I found this example from lists.trolltech.com/.../thread00020-0.html

#ifndef _DRAWGRAPHS_H_
#define _DRAWGRAPHS_H__
#include "math.h"

#endif


The opposite! An extra undescore in the #define instead. Don't understand this. Is this something that is compiler dependant? The NXP examples are probably made for LPCExpresso. What is the right way in Keil?
Couldn't get the

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to work. At least not in preview.

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