Index: src/OptionHandlerFactory.cc
===================================================================
--- src/OptionHandlerFactory.cc	(revision 2289)
+++ src/OptionHandlerFactory.cc	(working copy)
@@ -178,7 +178,7 @@
     SharedHandle<OptionHandler> op(new BooleanOptionHandler
                                    (PREF_DISABLE_IPV6,
                                     TEXT_DISABLE_IPV6,
-                                    V_FALSE,
+                                    V_TRUE,
                                     OptionHandler::OPT_ARG));
     op->addTag(TAG_ADVANCED);
     handlers.push_back(op);
Index: src/util.h
===================================================================
--- src/util.h	(revision 2289)
+++ src/util.h	(working copy)
@@ -55,6 +55,7 @@
 #include "a2time.h"
 #include "a2netcompat.h"
 #include "a2functional.h"
+#include "RequestGroup.h"
 
 namespace aria2 {