D47584.id146478.diff
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	diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
	--- a/sys/sys/cdefs.h
	+++ b/sys/sys/cdefs.h
	@@ -1,4 +1,3 @@
	-/*-
	* SPDX-License-Identifier: BSD-3-Clause
	*
	* Copyright (c) 1991, 1993
	@@ -513,7 +512,16 @@
	#define _POSIX_C_SOURCE 199209
	#endif

	-/* Deal with various X/Open Portability Guides and Single UNIX Spec. */
	+/*
	+ * Deal with various X/Open Portability Guides and Single UNIX Spec. We use the
	+ * '- 0' construct so software that defines _XOPEN_SOURCE to nothing doesn't
	+ * cause errors. X/Open CAE Specification, August 1994, System Interfaces and
	+ * Headers, Issue 4, Version 2 section 2.2 states an empty definition means the
	+ * same thing as _POSIX_C_SOURCE == 2. This broadly mirrors "System V Interface
	+ * Definition, Fourth Edition", but earlier editions suggest some ambiguity.
	+ * However, FreeBSD has histoically implemented this as a NOP, so we just
	+ * document what it should be for now to not break ports gratuitously.
	+ */
	#ifdef _XOPEN_SOURCE
	#if _XOPEN_SOURCE - 0 >= 800
	#define __XSI_VISIBLE 800
	@@ -531,6 +539,8 @@
	#define __XSI_VISIBLE 500
	#undef _POSIX_C_SOURCE
	#define _POSIX_C_SOURCE 199506
	+#else
	+/* #define _POSIX_C_SOURCE 199209 */
	#endif
	#endif