Disable IPv6 for MinGW build by default

src/OptionHandlerFactory.cc

@@ -229,7 +229,17 @@ OptionHandlerFactory::createOptionHandlers()
     SharedHandle<OptionHandler> op(new BooleanOptionHandler
                                    (PREF_DISABLE_IPV6,
                                     TEXT_DISABLE_IPV6,
+#ifdef __MINGW32__
+                                    // Disable IPv6 by default for
+                                    // MinGW build.  This is because
+                                    // numerous IPv6 routines are
+                                    // available from Vista.  Checking
+                                    // getaddrinfo failed in
+                                    // configure.
+                                    A2_V_TRUE,
+#else // !__MINGW32__
                                     A2_V_FALSE,
+#endif // !__MINGW32__
                                     OptionHandler::OPT_ARG));
     op->addTag(TAG_ADVANCED);
     handlers.push_back(op);