https://github.com/TeX-Live/texlive-source/commit/bb307f8bd91c5ea4f191b9c788056470626893b7

From bb307f8bd91c5ea4f191b9c788056470626893b7 Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Thu, 2 Feb 2023 22:57:47 +0000
Subject: [PATCH] avoid implicit wait and exit declarations for C99

git-svn-id: svn://tug.org/texlive/trunk/Build/source@65717 c570f23f-e606-0410-a88d-b1316a301751
--- a/configure
+++ b/configure
@@ -16406,6 +16406,9 @@ else $as_nop
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
 #ifdef HAVE_VFORK_H
 #include <vfork.h>
 #endif
@@ -16427,7 +16430,7 @@ main (void)
 
     while (wait(&status) != child)
       ;
-    exit(
+    _exit(
 	 /* Was there some problem with vforking?  */
 	 child < 0
 
--- a/m4/xdvi-func-setsid-in-fork.m4
+++ b/m4/xdvi-func-setsid-in-fork.m4
@@ -22,6 +22,9 @@ AC_DEFUN([XDVI_FUNC_SETSID_IN_VFORK],
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
 #ifdef HAVE_VFORK_H
 #include <vfork.h>
 #endif]],
@@ -40,7 +43,7 @@ AC_DEFUN([XDVI_FUNC_SETSID_IN_VFORK],
 
     while (wait(&status) != child)
       ;
-    exit(
+    _exit(
 	 /* Was there some problem with vforking?  */
 	 child < 0