Index: modules/diagrams/core.tcl
--- modules/diagrams/core.tcl.orig
+++ modules/diagrams/core.tcl
@@ -18,7 +18,7 @@
 # # ## ### ##### ######## ############# ######################
 ## Requisites
 
-package require Tcl 8.5              ; # Want the nice things it
+package require Tcl 8.5-             ; # Want the nice things it
                                        # brings (dicts, {*}, etc.)
 package require snit                 ; # Object framework.
 package require diagram::direction   ; # Database of named directions
