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/usr/include/x86_64-linux-gnu/asm/mman.h is in linux-libc-dev 3.2.78-1.

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#ifndef _ASM_X86_MMAN_H
#define _ASM_X86_MMAN_H

#define MAP_32BIT	0x40		/* only give out 32bit addresses */

#include <asm-generic/mman.h>

#endif /* _ASM_X86_MMAN_H */