--- ./sql/sql_yacc.cc.ORIGIN	2019-07-05 10:03:10 -0500
+++ ./sql/sql_yacc.cc	2019-07-16 14:48:35 -0500
@@ -310,7 +310,7 @@
      The result will be in the process stderr (var/log/master.err)
    */
 
-  extern int yydebug;
+  static int yydebug;
   yydebug= 1;
 }
 #endif