3 files changed, 23 insertions, 8 deletions

diff --git a/NEWS b/NEWS
index 8b160c8..ffff548 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,7 @@ This file documents the major additions and syntax changes between releases.
         The "negate" utility can now remap custom states
         Check_radius now supports radiusclient-ng
         Check_by_ssh now supports multiline output
+        IPv6 support can now be disabled using ./configure --without-ipv6
 
 1.4.9 4th June 2006
         Inclusion of contrib/check_cluster2 as check_cluster with some improvements
diff --git a/configure.in b/configure.in
index ee928d4..5153b1c 100644
--- a/configure.in
+++ b/configure.in
@@ -275,9 +275,15 @@ else
   AC_SUBST(MYSQLCFLAGS)
 fi
 
+AC_ARG_WITH([ipv6],
+        [AS_HELP_STRING([--with-ipv6], [support IPv6 @<:@default=check@:>@])],
+        [], [with_ipv6=check])
+
 dnl Check for AF_INET6 support - unistd.h required for Darwin
-AC_CACHE_CHECK([for IPv6 support], with_ipv6, [
-        AC_TRY_COMPILE([#ifdef HAVE_UNISTD_H
+if test "$with_ipv6" != "no"; then
+        AC_CACHE_CHECK([for IPv6 support], np_cv_sys_ipv6, [
+                AC_TRY_COMPILE(
+                        [#ifdef HAVE_UNISTD_H
                         #include <unistd.h>
                         #endif
                         #include <netinet/in.h>
@@ -288,12 +294,16 @@ AC_CACHE_CHECK([for IPv6 support], with_ipv6, [
                         sin6.sin6_family = AF_INET6;
                         sin6.sin6_port = 587;
                         p = &sin6.sin6_addr;],
-                        [with_ipv6=yes], 
-                        [with_ipv6=no])
-        ])
-
-if test x"$with_ipv6" != xno ; then
-        AC_DEFINE(USE_IPV6,1,[Enable IPv6 support])
+                        [np_cv_sys_ipv6=yes],
+                        [np_cv_sys_ipv6=no])
+                ])
+        if test "$np_cv_sys_ipv6" = "no" -a "$with_ipv6" != "check"; then
+                AC_MSG_FAILURE([--with-ipv6 was given, but test for IPv6 support failed])
+        fi
+        if test "$np_cv_sys_ipv6" = "yes"; then
+                AC_DEFINE(USE_IPV6,1,[Enable IPv6 support])
+        fi
+        with_ipv6="$np_cv_sys_ipv6"
 fi
 
 
diff --git a/plugins/netutils.c b/plugins/netutils.c
index e6ffc54..7bf2254 100644
--- a/plugins/netutils.c
+++ b/plugins/netutils.c
@@ -39,7 +39,11 @@
 unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT; 
 int econn_refuse_state = STATE_CRITICAL;
 int was_refused = FALSE;
+#if USE_IPV6
 int address_family = AF_UNSPEC;
+#else
+int address_family = AF_INET;
+#endif
 
 /* handles socket timeouts */
 void