Index: common/tclAppInit.cc
--- common/tclAppInit.cc.orig
+++ common/tclAppInit.cc
@@ -237,7 +237,6 @@ int
 Tcl_AppInit(Tcl_Interp *interp)
 {
 #ifdef MEMDEBUG_SIMULATIONS
-        extern MemTrace *globalMemTrace;
         globalMemTrace = new MemTrace;
 #endif