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From: Andreas Leitgeb <avl@logic.at>
Newsgroups: comp.lang.tcl
Subject: Re: how to use diagram-viewer and the diagram pkg
Date: Wed, 17 Jul 2024 08:15:36 -0000 (UTC)
Organization: A noiseless patient Spider
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Mark Summerfield <mark@qtrac.eu> wrote:
> $ wish9 ~/opt/tcl9/bin/diagram-viewer show /tmp/a.dia
> Creating safe environment, please wait...
> /home/mark/opt/tcl9/bin/diagram-viewer: can't find package diagram
> $ wish9
> % package require diagram
> 1

The "Creating safe environment, please wait..." might be the key here.
Check what the diagram viewer does after emitting that line, and see
if you can still "package require diagram" in that context.

If the "safe environment" is related to a safe interpreter, 
you might need to add more code to the diagram-viewer to 
allow the safe interp to load that particular package.

If I had it in my head, I'd write it - I hope someone else
can describe the extra "magic" needed to enable a package
in a safe interp.