Index: /trunk/src/VBox/Additions/common/VBoxService/VBoxServiceBalloon.cpp
===================================================================
--- /trunk/src/VBox/Additions/common/VBoxService/VBoxServiceBalloon.cpp	(revision 27495)
+++ /trunk/src/VBox/Additions/common/VBoxService/VBoxServiceBalloon.cpp	(revision 27496)
@@ -38,4 +38,7 @@
 #ifdef RT_OS_LINUX
 # include <sys/mman.h>
+# ifndef MADV_DONTFORK
+#  define MADV_DONTFORK 10
+# endif
 #endif