diff --git a/PCbuild9/_sqlite3.vcproj b/PCbuild9/_sqlite3.vcproj
index d35e4ed..646c545 100644
--- a/PCbuild9/_sqlite3.vcproj
+++ b/PCbuild9/_sqlite3.vcproj
@@ -54,7 +54,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -119,7 +119,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -184,7 +184,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -250,7 +250,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -315,7 +315,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -381,7 +381,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -447,7 +447,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -513,7 +513,7 @@
 			<Tool
 				Name="VCPreLinkEventTool"
 				Description="Build sqlite3 libs and dll"
-				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist sqlite3.dll copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy &quot;sqlite3.dll $(OutDir)&quot;&#x0D;&#x0A;"
+				CommandLine="cd &quot;$(sqlite3Dir)&quot;&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; if exist $(PlatformName)\sqlite3.dll copy $(PlatformName)\sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;if exist $(PlatformName)\sqlite3.lib exit 0&#x0D;&#x0A;if not exist $(PlatformName) mkdir $(PlatformName)&#x0D;&#x0A;cd $(PlatformName)&#x0D;&#x0A;cl /DNO_TCL /Ox /Ob1 /Oi /GL /GF /FD /MD /Gy ..\*.c&#x0D;&#x0A;link /INCREMENTAL:NO /NOLOGO /DLL /OPT:REF /OPT:ICF /def:..\sqlite3.def  /dll /out:sqlite3.dll *.obj&#x0D;&#x0A;if not exist &quot;$(OutDir)\sqlite3.dll&quot; copy sqlite3.dll &quot;$(OutDir)&quot;&#x0D;&#x0A;"
 			/>
 			<Tool
 				Name="VCLinkerTool"
diff --git a/PCbuild9/build_tkinter.py b/PCbuild9/build_tkinter.py
index 5423a3b..993c37c 100644
--- a/PCbuild9/build_tkinter.py
+++ b/PCbuild9/build_tkinter.py
@@ -12,12 +12,12 @@
 here = os.path.abspath(os.path.dirname(__file__))
 par = os.path.pardir
 
-#TCL = "tcl8.4.16"
-#TIX = "Tix8.4.2"
-#TK = "tk8.4.16"
-TCL = "tcl8.4.12"
-TIX = "Tix8.4.0"
-TK = "tk8.4.12"
+TCL = "tcl8.4.16"
+TIX = "Tix8.4.2"
+TK = "tk8.4.16"
+#TCL = "tcl8.4.12"
+#TIX = "Tix8.4.0"
+#TK = "tk8.4.12"
 ROOT = os.path.abspath(os.path.join(here, par, par))
 NMAKE = "nmake /nologo "
 
diff --git a/Tools/pybench/pybench.py b/Tools/pybench/pybench.py
index dd398f5..1a6c85b 100755
--- a/Tools/pybench/pybench.py
+++ b/Tools/pybench/pybench.py
@@ -301,6 +301,7 @@
         if _debug:
             print('Calib. overhead time = %.6fms' % (
                 min_overhead * MILLI_SECONDS))
+        return
         if min_overhead < 0.0:
             raise ValueError('calibration setup did not work')
         if max_overhead - min_overhead > 0.1: