Index: modules/controlwidget/voltmeter.tcl
--- modules/controlwidget/voltmeter.tcl.orig
+++ modules/controlwidget/voltmeter.tcl
@@ -42,6 +42,6 @@
 #
 
-package require Tk   8.5
+package require Tk
 package require snit
 package provide voltmeter 0.1
 
