Hello,
   if you have transferred the installation from a MAC X86, you must first reinstall brew by removing the folder from /usr/local/opt and creating one in /opt/homebrew.
You can find instructions on the homebrew website.
Then, installing therion via brew also works in --head mode.

enrico

On Thu, Oct 30, 2025 at 9:00 AM Anže Abram <anze.abram@gmail.com> wrote:

Greetings.

I've been trying to reinstall Therion on a new M-series macbook on the newest OS (Tahoe) but have run into several 'dead ends'.

(1) First I tried the homebrew method, but I ran into the same issue as several others. The whole homebrew route seems to be broken currently.

https://github.com/ladislavb/homebrew-therion/issues/15

(2) I tried to compile it from source, but it gets stuck while trying to compile Loch with the following error:

In file included from lxSetup.cxx:39:

./lxData.h:35:10: fatal error: 'vtkPolyData.h' file not found

   35 | #include <vtkPolyData.h>

      |          ^~~~~~~~~~~~~~~

1 error generated.

make[1]: *** [lxSetup.o] Error 1

make: *** [loch/loch] Error 2

Does anyone know of a solution, how to tackle any of these problems by chance? Thanks in advance,

Anze 

Anže Abram

Ulica bratov Učakar 84, 1000 Ljubljana

SI - Slovenia

M +386 41 480 906

@ anze.abram@gmail.com

Naše oči je zalila

lava goreča.

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--

Enrico Fratnik

e. enrico.fratnik@gmail.com
PEC enrico@pec.fratnik.it
skype: fratnike
t. +39.335.6573879

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