##### http://autoconf-archive.cryp.to/etr_sysv_ipc.html
#
# SYNOPSIS
#
#   ETR_SYSV_IPC
#
# DESCRIPTION
#
#   This macro checks for the SysV IPC header files. It only checks
#   that you can compile a program with them, not whether the system
#   actually implements working SysV IPC.
#
# LAST MODIFICATION
#
#   2001-05-25
#
# COPYLEFT
#
#   Copyright (c) 2001 Warren Young <warren@etr-usa.com>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.

AC_DEFUN([ETR_SYSV_IPC],
[
AC_CACHE_CHECK([for System V IPC headers], ac_cv_sysv_ipc, [
        AC_TRY_COMPILE(
                [
                        #include <sys/types.h>
                        #include <sys/ipc.h>
                        #include <sys/msg.h>
                        #include <sys/sem.h>
                        #include <sys/shm.h>
                ],, ac_cv_sysv_ipc=yes, ac_cv_sysv_ipc=no)
])

        if test x"$ac_cv_sysv_ipc" = "xyes"
        then
                AC_DEFINE(HAVE_SYSV_IPC, 1, [ Define if you have System V IPC ])
        fi
]) dnl ETR_SYSV_IPC