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	diff --git a/lib/libc/csu/libc_start1.c b/lib/libc/csu/libc_start1.c
	--- a/lib/libc/csu/libc_start1.c
	+++ b/lib/libc/csu/libc_start1.c
	@@ -28,6 +28,7 @@
	#include <sys/param.h>
	#include <sys/elf.h>
	#include <sys/elf_common.h>
	+#include <errno.h>
	#include <stdlib.h>
	#include "libc_private.h"

	@@ -169,6 +170,13 @@
	}

	handle_static_init(argc, argv, env);
	+
	+ /*
	+ * C17 4.3 paragraph 3:
	+ * The value of errno in the initial thread is zero at program
	+ * startup.
	+ */
	+ errno = 0;
	exit(mainX(argc, argv, env));
	}

	@@ -194,5 +202,6 @@
	monstartup(eprolp, etextp);

	handle_static_init(argc, argv, env);
	+ errno = 0;
	exit(mainX(argc, argv, env));
	}