Recent upgrade to wish leads to a problem

[Fergus]

Previously bin/wish was a link to wish84.exe (from memory). Recently it 
was upgraded to wish 8.5.exe.
Now, unless X is also running, wish fails with

$ wish
% Application initialization failed: no display name and no $DISPLAY 
environment variable

I'm not quite certain which recently upgraded package led to this: 
tcl-tk or tcltk or ...
Have I identified a real glitch and if so can this problem be addressed?
Fergus

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