--- old/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp	2016-08-03 21:02:37.000000000 +0200
+++ new/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp	2016-08-14 10:59:51.395354850 +0200
@@ -41,6 +41,11 @@
 #include <errno.h>
 #include <sys/mman.h>
 
+#if OS(LINUX) && defined(MADV_FREE)
+// Added in Linux 4.5, but we don't want to depend on 4.5 at runtime
+#undef MADV_FREE
+#endif
+
 #ifndef MADV_FREE
 #define MADV_FREE MADV_DONTNEED
 #endif