Index: tkdiff/tkdiff
===================================================================
--- tkdiff/tkdiff
+++ tkdiff/tkdiff	2009-05-31 13:18:49.000000000 +0200
@@ -155,7 +155,11 @@
 #debug-info "entryfont $entryfont"
 
 set font [list $textfont]
-set bold [list [concat $textfont bold]]
+if {$tk_version < 8.5} {
+  set bold [list [concat $textfont bold]]
+} else {
+  set bold [list [concat $textfont -12 bold]]
+}
 #debug-info "font: $font"
 #debug-info "bold: $bold\n"
 option add *Label.font $labelfont userDefault