--- a/src/java.desktop/share/native/libawt/awt/image/cvutils/img_colors.h	Wed Mar 28 21:00:09 2018 +0200
+++ b/src/java.desktop/share/native/libawt/awt/image/cvutils/img_colors.h	Wed Mar 28 23:56:08 2018 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 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
@@ -23,10 +23,13 @@
  * questions.
  */
 
-extern void img_makePalette(int cmapsize, int tablesize, int lookupsize,
-                            float lscale, float weight,
-                            int prevclrs, int doMac,
-                            unsigned char *reds,
-                            unsigned char *greens,
-                            unsigned char *blues,
-                            unsigned char *lookup);
+#include "jni.h"
+
+JNIEXPORT void JNICALL
+img_makePalette(int cmapsize, int tablesize, int lookupsize,
+                float lscale, float weight,
+                int prevclrs, int doMac,
+                unsigned char *reds,
+                unsigned char *greens,
+                unsigned char *blues,
+                unsigned char *lookup);