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/usr/include/linux/kdev_t.h is in linux-libc-dev 3.2.0-23.36.

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#ifndef _LINUX_KDEV_T_H
#define _LINUX_KDEV_T_H

/*
Some programs want their definitions of MAJOR and MINOR and MKDEV
from the kernel sources. These must be the externally visible ones.
*/
#define MAJOR(dev)	((dev)>>8)
#define MINOR(dev)	((dev) & 0xff)
#define MKDEV(ma,mi)	((ma)<<8 | (mi))
#endif