diff -Naur jdk12u-jdk-12.0.2+10.orig/src/java.security.jgss/share/native/libj2gss/NativeFunc.c jdk12u-jdk-12.0.2+10/src/java.security.jgss/share/native/libj2gss/NativeFunc.c
--- jdk12u-jdk-12.0.2+10.orig/src/java.security.jgss/share/native/libj2gss/NativeFunc.c	2019-07-16 18:38:28.000000000 +0200
+++ jdk12u-jdk-12.0.2+10/src/java.security.jgss/share/native/libj2gss/NativeFunc.c	2021-11-28 17:26:14.142894977 +0100
@@ -27,6 +27,9 @@
 #include <stdlib.h>
 #include "NativeFunc.h"
 
+/* global GSS function table */
+GSS_FUNCTION_TABLE_PTR ftab;
+
 /* standard GSS method names (ordering is from mapfile) */
 static const char RELEASE_NAME[]                = "gss_release_name";
 static const char IMPORT_NAME[]                 = "gss_import_name";
diff -Naur jdk12u-jdk-12.0.2+10.orig/src/java.security.jgss/share/native/libj2gss/NativeFunc.h jdk12u-jdk-12.0.2+10/src/java.security.jgss/share/native/libj2gss/NativeFunc.h
--- jdk12u-jdk-12.0.2+10.orig/src/java.security.jgss/share/native/libj2gss/NativeFunc.h	2019-07-16 18:38:28.000000000 +0200
+++ jdk12u-jdk-12.0.2+10/src/java.security.jgss/share/native/libj2gss/NativeFunc.h	2021-11-28 17:26:32.046873805 +0100
@@ -277,6 +277,6 @@
 typedef GSS_FUNCTION_TABLE *GSS_FUNCTION_TABLE_PTR;
 
 /* global GSS function table */
-GSS_FUNCTION_TABLE_PTR ftab;
+extern GSS_FUNCTION_TABLE_PTR ftab;
 
 #endif