# hostname.m4 serial 1 (gettext-0.11)

dnl Copyright (C) 2001-2002, 2015 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

# Prerequisites of the hostname.c program.

AC_DEFUN([gt_PREREQ_HOSTNAME],

[

  AC_CHECK_HEADERS(arpa/inet.h)

  AC_CHECK_FUNCS(gethostname gethostbyname inet_ntop)

  AC_MSG_CHECKING([for IPv6 sockets])

  AC_CACHE_VAL(gt_cv_socket_ipv6,[

    AC_TRY_COMPILE([

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>],

[int x = AF_INET6; struct in6_addr y; struct sockaddr_in6 z;],

      gt_cv_socket_ipv6=yes, gt_cv_socket_ipv6=no)

  ])

  AC_MSG_RESULT($gt_cv_socket_ipv6)

  if test $gt_cv_socket_ipv6 = yes; then

    AC_DEFINE(HAVE_IPV6, 1, [Define if <sys/socket.h> defines AF_INET6.])

  fi

])