--- a/hotspot/src/share/vm/runtime/vm_version.cpp	Mon Nov 02 09:11:55 2015 -0800
+++ b/hotspot/src/share/vm/runtime/vm_version.cpp	Wed Nov 04 11:00:29 2015 -0800
@@ -64,6 +64,10 @@
   #error VERSION_STRING must be defined
 #endif
 
+#ifndef DEBUG_LEVEL
+  #error DEBUG_LEVEL must be defined
+#endif
+
 // NOTE: Builds within Visual Studio do not define the build target in
 //       HOTSPOT_VERSION_STRING, so it must be done here
 #if defined(VISUAL_STUDIO_BUILD) && !defined(PRODUCT)
@@ -243,6 +247,10 @@
   return HOTSPOT_BUILD_USER;
 }
 
+const char *Abstract_VM_Version::jdk_debug_level() {
+  return DEBUG_LEVEL;
+}
+
 unsigned int Abstract_VM_Version::jvm_version() {
   return ((Abstract_VM_Version::vm_major_version() & 0xFF) << 24) |
          ((Abstract_VM_Version::vm_minor_version() & 0xFF) << 16) |