diff -up v8-3.14.5.10/src/ia32/cpu-ia32.cc.system-valgrind v8-3.14.5.10/src/ia32/cpu-ia32.cc
--- v8-3.14.5.10/src/ia32/cpu-ia32.cc.system-valgrind	2012-01-16 06:42:08.000000000 -0500
+++ v8-3.14.5.10/src/ia32/cpu-ia32.cc	2014-12-02 15:15:07.819525430 -0500
@@ -28,7 +28,7 @@
 // CPU specific code for ia32 independent of OS goes here.
 
 #ifdef __GNUC__
-#include "third_party/valgrind/valgrind.h"
+#include <valgrind/valgrind.h>
 #endif
 
 #include "v8.h"
@@ -67,8 +67,7 @@ void CPU::FlushICache(void* start, size_
   // solution is to run valgrind with --smc-check=all, but this comes at a big
   // performance cost.  We can notify valgrind to invalidate its cache.
 #ifdef VALGRIND_DISCARD_TRANSLATIONS
-  unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size);
-  USE(res);
+  VALGRIND_DISCARD_TRANSLATIONS(start, size);
 #endif
 }
 
diff -up v8-3.14.5.10/src/x64/cpu-x64.cc.system-valgrind v8-3.14.5.10/src/x64/cpu-x64.cc
--- v8-3.14.5.10/src/x64/cpu-x64.cc.system-valgrind	2012-02-23 03:45:21.000000000 -0500
+++ v8-3.14.5.10/src/x64/cpu-x64.cc	2014-12-02 15:14:51.289621074 -0500
@@ -28,7 +28,7 @@
 // CPU specific code for x64 independent of OS goes here.
 
 #if defined(__GNUC__) && !defined(__MINGW64__)
-#include "third_party/valgrind/valgrind.h"
+#include <valgrind/valgrind.h>
 #endif
 
 #include "v8.h"
@@ -67,8 +67,7 @@ void CPU::FlushICache(void* start, size_
   // solution is to run valgrind with --smc-check=all, but this comes at a big
   // performance cost.  We can notify valgrind to invalidate its cache.
 #ifdef VALGRIND_DISCARD_TRANSLATIONS
-  unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size);
-  USE(res);
+  VALGRIND_DISCARD_TRANSLATIONS(start, size);
 #endif
 }