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This code was added in 1.2 by brezak with changes for the commit message: "Change <sys/dir.h> to <dirent.h>" and looks like it never worked.
$NetBSD: README,v 1.2 2003/11/12 13:31:08 grant Exp $ This is the CMU sup system, converted to use a NetBSD Makefile infrastructure. To build the sup system for another operating system, go into the "source" subdirectory, and use the Makefile provided there. -- Jason R. Thorpe <thorpej@NetBSD.org> October 6, 1997