Index: tcl.mk
===================================================================
--- tcl.mk	(revision 339340)
+++ tcl.mk	(working copy)
@@ -57,7 +57,13 @@
 # Build-time / Run-time only dependencies can be specified with build or run.
 #
 
-.if !defined(_INCLUDE_USES_TCL_MK)
+.if ${USES:Mtk} || ${USES:Mtk\:*}
+.if !defined(_TCLTK_PORT)
+_TCLTK_IGNORE=	yes
+.endif
+.endif
+
+.if !defined(_INCLUDE_USES_TCL_MK) && !defined(_TCLTK_IGNORE)
 _INCLUDE_USES_TCL_MK=	yes
 
 #
@@ -200,3 +206,5 @@
 .endif
 
 .endif # defined(_INCLUDE_USES_TCL_MK)
+
+.undef _TCLTK_IGNORE
Index: tk.mk
===================================================================
--- tk.mk	(revision 339340)
+++ tk.mk	(working copy)
@@ -4,10 +4,6 @@
 #
 #
 
-.if ${USES:Mtcl} || ${USES:Mtcl\:*}
-IGNORE= Do not set both tcl and tk in USES
-.endif
-
 .if defined(tk_ARGS)
 tcl_ARGS:=	${tk_ARGS}
 .endif