--- old/src/java.base/share/native/libjava/jni_util.h	2018-03-23 14:24:11.425158066 +0100
+++ new/src/java.base/share/native/libjava/jni_util.h	2018-03-23 14:24:11.205158068 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -395,8 +395,11 @@
 void buildJniFunctionName(const char *sym, const char *cname,
                           char *jniEntryName);
 
-extern size_t getLastErrorString(char *buf, size_t len);
-extern int getErrorString(int err, char *buf, size_t len);
+JNIEXPORT size_t JNICALL
+getLastErrorString(char *buf, size_t len);
+
+JNIEXPORT int JNICALL
+getErrorString(int err, char *buf, size_t len);
 
 #ifdef STATIC_BUILD
 /* Macros for handling declaration of static/dynamic