Index: lib/libc/sys/Makefile.inc
===================================================================
--- lib/libc/sys/Makefile.inc
+++ lib/libc/sys/Makefile.inc
@@ -49,7 +49,7 @@
 SRCS+= pipe.c
 SRCS+= shm_open.c
 SRCS+= vadvise.c
-SRCS+= _Fork.c
+SRCS+= POSIX2x_Fork.c
 
 SRCS+=	compat-stub.c
 
Index: lib/libc/sys/_Fork.c
===================================================================
--- /dev/null
+++ lib/libc/sys/_Fork.c
@@ -1,45 +0,0 @@
-/*
- * Copyright (c) 2021 The FreeBSD Foundation.
- * All rights reserved.
- *
- * Portions of this software were developed by Konstantin Belousov
- * under sponsorship from the FreeBSD Foundation.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice(s), this list of conditions and the following disclaimer as
- *    the first lines of this file unmodified other than the possible
- *    addition of one or more copyright notices.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice(s), this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/types.h>
-#include <unistd.h>
-#include "libc_private.h"
-
-#pragma weak _Fork
-pid_t
-_Fork(void)
-{
-	return (__sys_fork());
-}