mingw-w64-headers/include/packon.h - mingw-w64 - Git at Google

 /**
  * This file is part of the mingw-w64 runtime package.
  * No warranty is given; refer to the file DISCLAIMER within this package.
  */
 #if !(defined(lint) || defined(RC_INVOKED))
 #pragma pack(1)
 #endif
	/**
	* This file is part of the mingw-w64 runtime package.
	* No warranty is given; refer to the file DISCLAIMER within this package.
	*/
	#if !(defined(lint) \|\| defined(RC_INVOKED))
	#pragma pack(1)
	#endif