--- modules/tclsci/src/c/TCL_Command.c.orig	2020-02-25 10:00:14 UTC
+++ modules/tclsci/src/c/TCL_Command.c
@@ -38,6 +38,12 @@ int			TclInterpReturn;
 // Global Tcl Return Result.
 char *			TclInterpResult;
 
+/* The tclLoop thread Id
+in order to wait it ends when closing Scilab */
+__threadId TclThread;
+__threadSignal InterpReady;
+__threadSignalLock InterpReadyLock;
+
 // Single execution
 __threadLock		singleExecutionLock;
 
--- modules/tclsci/src/c/TCL_Command.h.orig	2020-02-25 10:00:14 UTC
+++ modules/tclsci/src/c/TCL_Command.h
@@ -85,9 +85,9 @@ char		*getTclCommandResult(void);
 
 /* The tclLoop thread Id
 in order to wait it ends when closing Scilab */
-__threadId TclThread;
+extern __threadId TclThread;
 
-__threadSignal InterpReady;
-__threadSignalLock InterpReadyLock;
+extern __threadSignal InterpReady;
+extern __threadSignalLock InterpReadyLock;
 
 #endif /* !__TCL_COMMAND_H__ */