--- old/src/java.desktop/share/native/libfreetype/include/freetype/ftmodapi.h	2019-11-22 09:36:18.550839095 -0800
+++ new/src/java.desktop/share/native/libfreetype/include/freetype/ftmodapi.h	2019-11-22 09:36:18.398839099 -0800
@@ -623,7 +623,7 @@
    *     it is bytecode interpreter's execution context, `TT_ExecContext`,
    *     which is declared in FreeType's internal header file `tttypes.h`.
    */
-  typedef void
+  typedef FT_Error
   (*FT_DebugHook_Func)( void*  arg );