Index: modules/diagrams/attributes.tcl
--- modules/diagrams/attributes.tcl.orig
+++ modules/diagrams/attributes.tcl
@@ -10,7 +10,7 @@
 # # ## ### ##### ######## ############# ######################
 ## Requisites
 
-package require Tcl 8.5             ; # Want the nice things it brings (dicts, {*}, etc.)
+package require Tcl 8.5-            ; # Want the nice things it brings (dicts, {*}, etc.)
 package require snit                ; # Object framework.
 package require struct::queue       ; # Word storage when processing attribute arguments.
 
