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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+/* getopt-on-non-glibc compatibility macros.
+ Copyright (C) 1989-2023 Free Software Foundation, Inc.
+ This file is part of gnulib.
+ Unlike most of the getopt implementation, it is NOT shared
+ with the GNU C Library.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#ifndef _GETOPT_CDEFS_H
+#define _GETOPT_CDEFS_H 1
+
+/* This header should not be used directly; include getopt.h or
+ unistd.h instead. It does not have a protective #error, because
+ the guard macro for getopt.h in gnulib is not fixed. */
+
+/* getopt-core.h and getopt-ext.h are shared with GNU libc, and expect
+ a number of the internal macros supplied to GNU libc's headers by
+ sys/cdefs.h. Provide fallback definitions for all of them. */
+#ifdef HAVE_SYS_CDEFS_H
+# include <sys/cdefs.h>
+#endif
+
+#ifndef __BEGIN_DECLS
+# ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# else
+# define __BEGIN_DECLS /* nothing */
+# endif
+#endif
+#ifndef __END_DECLS
+# ifdef __cplusplus
+# define __END_DECLS }
+# else
+# define __END_DECLS /* nothing */
+# endif
+#endif
+
+#ifndef __GNUC_PREREQ
+# if defined __GNUC__ && defined __GNUC_VERSION__
+# define __GNUC_PREREQ(maj, min) \
+ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+# else
+# define __GNUC_PREREQ(maj, min) 0
+# endif
+#endif
+
+#ifndef __THROW
+# if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major__ >= 4)
+# if __cplusplus >= 201103L
+# define __THROW noexcept (true)
+# else
+# define __THROW throw ()
+# endif
+# else
+# define __THROW
+# endif
+#endif
+
+#endif /* _GETOPT_CDEFS_H */