Index: tk.mk
===================================================================
--- tk.mk	(revision 339340)
+++ tk.mk	(working copy)
@@ -5,7 +5,7 @@
 #
 
 .if ${USES:Mtcl} || ${USES:Mtcl\:*}
-IGNORE= Do not set both tcl and tk in USES
+USES:=  ${USES:C/tcl(:.*)?//}
 .endif
 
 .if defined(tk_ARGS)