musl/include/sys/sysmacros.h

#ifndef _SYS_SYSMACROS_H
#define _SYS_SYSMACROS_H

#define major(x) ((unsigned)((x) >> 8) & 0xff)
#define minor(x) ((unsigned)(x) & 0xff)
#define makedev(x,y) (((x)<<8)|((y)&0xff))

#endif