dnl *
dnl * Copyright (c) 2001  Motoyuki Kasahara
dnl *
dnl * Redistribution and use in source and binary forms, with or without
dnl * modification, are permitted provided that the following conditions
dnl * are met:
dnl * 1. Redistributions of source code must retain the above copyright
dnl *    notice, this list of conditions and the following disclaimer.
dnl * 2. Redistributions in binary form must reproduce the above copyright
dnl *    notice, this list of conditions and the following disclaimer in the
dnl *    documentation and/or other materials provided with the distribution.
dnl * 3. Neither the name of the project nor the names of its contributors
dnl *    may be used to endorse or promote products derived from this software
dnl *    without specific prior written permission.
dnl * 
dnl * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
dnl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
dnl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
dnl * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORSBE
dnl * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
dnl * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
dnl * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dnl * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
dnl * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
dnl * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
dnl * THE POSSIBILITY OF SUCH DAMAGE.
dnl *

dnl * 
dnl * Check for h_errno.
dnl *
AC_DEFUN([AC_DECL_H_ERRNO],
[AC_CACHE_CHECK(for h_errno declaration in netdb.h, ac_cv_decl_h_errno,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <netdb.h>]], [[
h_errno = 0;
]])],[ac_cv_decl_h_errno=yes],[ac_cv_decl_h_errno=no])])
if test "$ac_cv_decl_h_errno" = yes; then
    AC_DEFINE(H_ERRNO_DECLARED, 1,
[Define to 1 if `h_errno' is declared by <netdb.h>])
fi])
