--- old/src/java.desktop/unix/native/libawt_xawt/xawt/XWindow.c	2018-09-18 12:45:06.483475513 -0700
+++ new/src/java.desktop/unix/native/libawt_xawt/xawt/XWindow.c	2018-09-18 12:45:06.215475517 -0700
@@ -64,7 +64,7 @@
  * However, HPkeysym.h is missing a couple of osf keysyms,
  * so I have #defined them below.
  */
-#include "HPkeysym.h"   /* HP vendor-specific */
+#include <X11/HPkeysym.h>   /* HP vendor-specific */
 
 #include "java_awt_event_KeyEvent.h"
 #include "java_awt_event_InputEvent.h"