X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=secnet.git;a=blobdiff_plain;f=configure.in;h=0c0c545aded3b2d86cf46e047cfc5f0de95057b8;hp=6959e2854a0cd610dbc2437190da82e3a9340b76;hb=328ae477c72b63616f28de2ff3ead9bf8d4752ba;hpb=44bdf5ac73d8a3a0849a0ae400caf4edc07a53e2

diff --git a/configure.in b/configure.in
index 6959e28..0c0c545 100644
--- a/configure.in
+++ b/configure.in
@@ -70,8 +70,18 @@ AC_CHECK_LIB(resolv,inet_aton)
 AC_CHECK_LIB(adns,adns_init)
 REQUIRE_HEADER([adns.h])
 
-dnl check for getopt in standard library
-AC_REPLACE_FUNCS([snprintf])
+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)
 
@@ -132,12 +142,6 @@ typedef unsigned char uint8_t;
 #endif
 #endif
 
-#ifndef HAVE_SNPRINTF
-#include <stdio.h>
-#include <stdarg.h>
-#include "snprintf.h"
-#endif
-
 #ifdef __GNUC__
 #define NORETURN(_x) void _x __attribute__ ((noreturn))
 #define FORMAT(_a,_b,_c) __attribute__ ((format (_a,_b,_c)))