sys/dir.h presently does:

	#include "dirent.h"

It needs instead to do:

	#include <dirent.h>

The first form causes GCC to look first in the directory containing
sys/dir.h, i.e. /usr/include/sys, and so it finds <sys/dirent.h>,
which does not contain all the declarations that 4.2-compatible
<sys/dir.h> must.

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