Index: generic/nsfStack.c
===================================================================
diff -u -r77104533a2105611e79a6723ece344e0ae6dc016 -r30e93c21e2be453a9e192b270844d86e04378c45
--- generic/nsfStack.c	(.../nsfStack.c)	(revision 77104533a2105611e79a6723ece344e0ae6dc016)
+++ generic/nsfStack.c	(.../nsfStack.c)	(revision 30e93c21e2be453a9e192b270844d86e04378c45)
@@ -100,9 +100,16 @@
 }
 
 static void Nsf_PopFrameObj(Tcl_Interp *interp, Tcl_CallFrame *framePtr) {
+
   /*fprintf(stderr,"POP  OBJECT_FRAME (Nsf_PopFrameObj) frame %p, vartable %p set to NULL, already %d\n",
     framePtr, Tcl_CallFrame_varTablePtr(framePtr), Tcl_CallFrame_varTablePtr(framePtr) == NULL);*/
-  Tcl_CallFrame_varTablePtr(framePtr) = NULL;
+
+  /* gcc 4.4.4 strict-aliasing rule does not like
+     Tcl_CallFrame_varTablePtr(framePtr) = NULL; 
+   */
+  CallFrame *callFrame = (CallFrame *)framePtr;
+  callFrame->varTablePtr = NULL; 
+
   Tcl_PopCallFrame(interp);
 }