This is an ELF codepoint that linux has.

--- webkitgtk-2.48.1/Source/JavaScriptCore/runtime/JSCBytecodeCacheVersion.cpp.orig
+++ webkitgtk-2.48.1/Source/JavaScriptCore/runtime/JSCBytecodeCacheVersion.cpp
@@ -42,6 +42,10 @@
 #endif
 #endif
 
+#ifndef NT_GNU_BUILD_ID
+#define NT_GNU_BUILD_ID 3
+#endif
+
 namespace JSC {
 
 namespace JSCBytecodeCacheVersionInternal {