Index: Mk/Uses/tcl.mk
===================================================================
--- Mk/Uses/tcl.mk	(revision 328031)
+++ Mk/Uses/tcl.mk	(working copy)
@@ -48,6 +48,8 @@
 # - 84+, 85+, 86+	- Depend on any installed version greater or equal to
 #   			  the specified version.
 #
+# - -84, -85, -86	- Mark a specific version as invalid
+#
 # If wrapper is specified, an additional dependency on tcl-wrapper or
 # tk-wrapper is added. It is NOT possible to select a specific version of
 # Tcl/Tk when using the wrapper.
@@ -84,6 +86,16 @@
 _TCLTK_WANTED_VERSION:=	${_TCL_ARGS:M8[4-6]}
 .endif
 
+.if ${_TCL_ARGS:M-8[4-6]}
+#    if an invalid version is specified, remove the invalid
+#    versions from the valid versions, and set the default
+#    version to the highest valid version
+_TCLTK_VALID_VERSIONS:= ${_TCLTK_VALID_VERSIONS:N${_TCL_ARGS:M-8[4-6]:S/-//g}}
+.  for _v in ${_TCLTK_VALID_VERSIONS}
+_TCLTK_DEFAULT_VERSION:= ${_v}
+.  endfor
+.endif
+
 .if ${_TCL_ARGS:Mwrapper} && defined(_TCLTK_WANTED_VERSION)
 IGNORE=	USES=${_TCLTK_PORT}: it is not possible to specify both a version and the wrapper: ${tcl_ARGS}
 .endif
@@ -92,14 +104,10 @@
 _TCLTK_WANTED_VERSION=	${_TCLTK_DEFAULT_VERSION}
 .endif
 
-# check that the specified ver+ is valid
-.if ! ${_TCLTK_VALID_VERSIONS:M${_TCLTK_WANTED_VERSION}}
-IGNORE=	USES=${_TCLTK_PORT}: incorrect ${_TCLTK_PORT} version specified: ${_TCLTK_WANTED_VERSION}
-.endif
-
+# resolve minimum versions
 .if defined(_TCLTK_MIN_VERSION)
 .  for _v in ${_TCLTK_VALID_VERSIONS}
-.    if ${_TCLTK_MIN_VERSION} < ${_v} || !exists(${LOCALBASE}/lib/lib${_TCLTK_PORT}${_v}.so)
+.    if ${_TCLTK_MIN_VERSION} > ${_v} || !exists(${LOCALBASE}/lib/lib${_TCLTK_PORT}${_v}.so)
 .    else
 _TCLTK_WANTED_VERSION=	${_v}
 .    endif
@@ -106,6 +114,11 @@
 .  endfor
 .endif
 
+# check that the resolved wanted version is valid
+.if ! ${_TCLTK_VALID_VERSIONS:M${_TCLTK_WANTED_VERSION}}
+IGNORE=	USES=${_TCLTK_PORT}: incorrect ${_TCLTK_PORT} version specified: ${_TCLTK_WANTED_VERSION}
+.endif
+
 #
 # Exported variables
 #