Trouble using Gforth, having installed via homebrew on OSX

[Alex Byrne]

I'm new to forth, and in fact low level programming entirely. I think the
language is neat, but using it is so far another matter! I've just
installed (ostensibly successfully) gforth 0.7.3 on a macOS 12.4 montery
apple m1 pro via homebrew. Unfortunately, I think the path is misconfigured
and I'm struggling to rectify it.

% gforth

gives

gforth: cannot open image file gforth.fi in path
.:/usr/local/lib/gforth/site-forth:/usr/local/share/gforth/site-forth:/usr/local/lib/gforth/0.7.3:/usr/local/share/gforth/0.7.3
for reading

It can't find the image. And echo $GFORTHPATH returns empty. So, I tried
instead:

% GFORTHPATH=/opt/homebrew/Cellar/gforth/0.7.3_3/lib/gforth/0.7.3
% exporth GFORTHPATH
% gforth

Which works, but isn't persistent across terminal instances.

I read that fixpath.fs might be relevant, and so tried to use that, but

% gforth fixpath.fs $GFORTHPATH gforth

Fixing gforth with
/opt/homebrew/Cellar/gforth/0.7.3_3/lib/gforth/0.7.3:/opt/homebrew/Cellar/gforth/0.7.3_3/share/gforth/0.7.3:/opt/homebrew/Cellar/gforth/0.7.3_3/share/gforth/site-forth

in file included from *OS command line*:-1
/opt/homebrew/Cellar/gforth/0.7.3_3/share/gforth/0.7.3/fixpath.fs:49:
No such file or directory
2 arg >>>fix-exe<<<
Backtrace:
$129842DE0 throw

even though that file does exist at that path. Not sure where to go from
here!

Thanks