+
+#ifdef __MSDOS__
+#include "msd_dir.h"
+#define NLENGTH(direct) ((direct)->d_namlen)
+
+#else /* not __MSDOS__ */
+
+#if defined(DIRENT) || defined(_POSIX_VERSION)
+#include <dirent.h>
+#define NLENGTH(direct) (strlen((direct)->d_name))
+#else /* not (DIRENT or _POSIX_VERSION) */
+#define dirent direct
+#define NLENGTH(direct) ((direct)->d_namlen)
+#ifdef SYSNDIR
+#include <sys/ndir.h>
+#endif /* SYSNDIR */
+#ifdef SYSDIR
+#include <sys/dir.h>
+#endif /* SYSDIR */
+#ifdef NDIR
+#include <ndir.h>
+#endif /* NDIR */
+#endif /* DIRENT or _POSIX_VERSION */
+
+#endif /* not __MSDOS__ */