Ensure pid_t gets defined. * m4/fcntl_h.m4 (gl_FCNTL_H): Require AC_TYPE_PID_T. * m4/sched_h.m4 (gl_SCHED_H): Likewise. * m4/signal_h.m4 (gl_SIGNAL_H): Likewise. * m4/spawn_h.m4 (gl_SPAWN_H): Likewise. * m4/sys_wait_h.m4 (gl_SYS_WAIT_H): Likewise. * m4/termios_h.m4 (gl_TERMIOS_H): Likewise. * m4/time_h.m4 (gl_HEADER_TIME_H_BODY): Likewise. * m4/unistd_h.m4 (gl_UNISTD_H): Likewise. * tests/test-fcntl-h.c: Check that pid_t is defined. * tests/test-sched.c: Likewise. * tests/test-termios.c: Likewise. * tests/test-time.c: Likewise. * doc/posix-headers/fcntl.texi: Mention lack of pid_t on MSVC platform. * doc/posix-headers/signal.texi: Likewise. * doc/posix-headers/sys_types.texi: Likewise. * doc/posix-headers/time.texi: Likewise.

--- a/m4/sys_wait_h.m4
+++ b/m4/sys_wait_h.m4
@@ -1,4 +1,4 @@
-# sys_wait_h.m4 serial 5
+# sys_wait_h.m4 serial 6
 dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -11,6 +11,9 @@
   dnl <sys/wait.h> is always overridden, because of GNULIB_POSIXCHECK.
   gl_CHECK_NEXT_HEADERS([sys/wait.h])
 
+  dnl Ensure the type pid_t gets defined.
+  AC_REQUIRE([AC_TYPE_PID_T])
+
   dnl Check for declarations of anything we want to poison if the
   dnl corresponding gnulib module is not in use.
   gl_WARN_ON_USE_PREPARE([[#include <sys/wait.h>]],