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diff --git a/include/ac/dirent.h b/include/ac/dirent.h
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+/* Generic dirent.h */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#ifndef _AC_DIRENT_H
+#define _AC_DIRENT_H
+
+#ifdef HAVE_DIRENT_H
+# include <dirent.h>
+# define NAMLEN(dirent) strlen((dirent)->d_name)
+#elif defined(_MSC_VER)
+#include <windows.h>
+#ifndef MAX_PATH
+#define MAX_PATH 260
+#endif
+struct dirent {
+ char *d_name;
+};
+typedef struct DIR {
+ HANDLE dir;
+ struct dirent data;
+ int first;
+ char buf[MAX_PATH+1];
+} DIR;
+DIR *opendir(const char *name);
+struct dirent *readdir(DIR *dir);
+int closedir(DIR *dir);
+#else
+# define dirent direct
+# define NAMLEN(dirent) (dirent)->d_namlen
+# ifdef HAVE_SYS_NDIR_H
+# include <sys/ndir.h>
+# endif
+# ifdef HAVE_SYS_DIR_H
+# include <sys/dir.h>
+# endif
+# ifdef HAVE_NDIR_H
+# include <ndir.h>
+# endif
+#endif
+
+#endif /* _AC_DIRENT_H */