diff -up tcl8.5.6/generic/tclPort.h.old tcl8.5.6/generic/tclPort.h
--- tcl8.5.6/generic/tclPort.h.old	2009-02-09 16:40:08.000000000 +0100
+++ tcl8.5.6/generic/tclPort.h	2009-02-09 16:40:26.000000000 +0100
@@ -24,7 +24,7 @@
 #if defined(__WIN32__)
 #   include "tclWinPort.h"
 #else
-#   include "tclUnixPort.h"
+#   include "../unix/tclUnixPort.h"
 #endif
 
 #if !defined(LLONG_MIN)