X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/b92d8e17fc23b0c034a2db47951d9fb2b2b1cbbf..86420bb75f19f628ffd2d8ff9964e59ed99e3187:/configure.in

diff --git a/configure.in b/configure.in
index 747d901..76e7e12 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,22 @@
 dnl Process this file with autoconf to produce a configure script.
 
+dnl This file is part of secnet.
+dnl See README for full list of copyright holders.
+dnl
+dnl secnet is free software; you can redistribute it and/or modify it
+dnl under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version d of the License, or
+dnl (at your option) any later version.
+dnl 
+dnl secnet is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+dnl General Public License for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl version 3 along with secnet; if not, see
+dnl https://www.gnu.org/licenses/gpl.html.
+
 sinclude(ac_prog_cc_no_writeable_strings.m4)
 
 AC_INIT(secnet,0.1.18+,secnet@chiark.greenend.org.uk)
@@ -27,7 +44,7 @@ AC_STDC_HEADERS
 AC_CHECK_HEADERS([stdint.h inttypes.h])
 AC_CHECK_HEADERS([net/if.h net/route.h])
 AC_CHECK_HEADERS([sys/socket.h])
-AC_CHECK_HEADERS([linux/if.h], [], [], 
+AC_CHECK_HEADERS([linux/if_tun.h], [], [], 
 [#if HAVE_SYS_SOCKET_H
 # include <sys/socket.h>
 #endif
@@ -64,12 +81,25 @@ AC_CHECK_LIB(fl,yywrap)
 if test "$ac_cv_lib_fl_yywrap" != yes; then
   AC_MSG_ERROR([A compatible libfl is required])
 fi
-AC_CHECK_LIB(nsl,inet_ntoa)
+SECNET_C_GETFUNC(inet_ntoa,nsl)
 AC_CHECK_LIB(socket,socket)
-AC_CHECK_LIB(resolv,inet_aton)
+SECNET_C_GETFUNC(inet_aton,resolv)
 AC_CHECK_LIB(adns,adns_init)
 REQUIRE_HEADER([adns.h])
 
+AC_MSG_NOTICE([Checking requirements for IPv6 support...])
+enable_ipv6=true
+m4_define(NO_IPV6,[enable_ipv6=false])
+AC_CHECK_DECL(AF_INET6,        [],[NO_IPV6],[#include <netinet/in.h>])
+AC_CHECK_FUNC(adns_addr2text,  [],[NO_IPV6])
+if $enable_ipv6; then
+    AC_MSG_NOTICE([Enabling IPv6 support])
+    AC_DEFINE(CONFIG_IPV6, 1,
+              [Define to 1 to use IPv6 support in system and adns])
+else
+    AC_MSG_WARN([Disabling IPv6 support])
+fi
+
 AC_OUTPUT(Makefile,echo timestamp >stamp-h)
 
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