diff -urN tcl8.5a5.org/unix/tclUnixInit.c tcl8.5a5/unix/tclUnixInit.c
--- tcl8.5a5.org/unix/tclUnixInit.c	2006-09-10 19:04:07.000000000 +0200
+++ tcl8.5a5/unix/tclUnixInit.c	2006-12-18 22:48:30.984344000 +0100
@@ -42,7 +42,7 @@
  * stack.
  */
 
-#undef TCL_NO_STACK_CHECK
+#define TCL_NO_STACK_CHECK 1
 
 /*
  * Define this if you want to see a lot of output regarding stack checking.