Since python2.6 must run on Windows 2000,
explicitely disable the use of Windows XP themes when compiling tk.
This is also consistent with the WINVER=0x0500 option.
diff --git a/Tools/buildbot/external.bat b/Tools/buildbot/external.bat
index 592c585..a849526 100644
--- a/Tools/buildbot/external.bat
+++ b/Tools/buildbot/external.bat
@@ -14,8 +14,8 @@
 

 if not exist tcltk\bin\tk85.dll (

     cd tk-8.5.2.0\win    

-    nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 DEBUG=1 INSTALLDIR=..\..\tcltk TCLDIR=..\..\tcl-8.5.2.1 clean

-    nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 DEBUG=1 INSTALLDIR=..\..\tcltk TCLDIR=..\..\tcl-8.5.2.1 all

-    nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 DEBUG=1 INSTALLDIR=..\..\tcltk TCLDIR=..\..\tcl-8.5.2.1 install

+    nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 INSTALLDIR=..\..\tcltk TCLDIR=..\..\tcl-8.5.2.1 clean

+    nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 INSTALLDIR=..\..\tcltk TCLDIR=..\..\tcl-8.5.2.1 all

+    nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 INSTALLDIR=..\..\tcltk TCLDIR=..\..\tcl-8.5.2.1 install

     cd ..\..

 )