[Therion] Running Xtherion on Mac OS X Catalina

[David Eason]

Dear Therion mailing list,

I wonder if anyone has had any success building, installing and running
Therion on Mac OS X Catalina (OS 10.15.2)? I have successfully built and
installed Therion 5.4.4, and Therion and Loch both run fine. Before the
upgrade, everything worked OK, but it looks like some things have moved
around in this version of OS X, amongst other things breaking. When I try
to run Xtherion, Tcl/Tk can't seem to locate BWidget, and the GUI can't run:

Error in startup script: can't find package BWidget
    while executing
"package require BWidget"
    (file "/usr/local/bin/xtherion" line 12268)

I have tried unpacking the bwidget 1.9.14 scripts to /usr/local/lib
thinking that tcl would check there, and then also tried to set auto_path
to force tcl to look in there, but it won't seem to start up. There's a
pause, and Wish seems to start up, and yet XQuartz actually opens; I have
tcl 8.6 installed and can run the tclsh OK.

It's been frustrating me for a while, and I saw this lockdown in the UK as
an opportunity to have another look at this. Any pointers or tips would be
most welcome.

Regards,
David Eason
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