Hi Leo,
I get the following output:

#+RESULTS:
#+begin_example
(linenum:0,
#+end_example

and from *messages*:

Executing Maxima source code block
maxima -r \(linenum\:0\,\
batchload\(\"/var/folders/f5/6nrph1812wdf0nlg4ddcs_580000gn/T/babel-wImUPJ/maxima-Swf2M2.max\"\)\)\$
 --very-quiet
Wrote
/var/folders/f5/6nrph1812wdf0nlg4ddcs_580000gn/T/babel-wImUPJ/ob-input-Rbgtzp
Code block evaluation complete (took 0.1s).

The contents of that file (which I also attach) are:

build_info();

If there's more information I can give, just let me know.
Thanks,
Benjamin

On Tue, Dec 10, 2024 at 9:17 AM Leo Butler <Leo.Butler@umanitoba.ca> wrote:

> On Mon, Dec 09 2024, Leo Butler <Leo.Butler@umanitoba.ca> wrote:
>
> > On Sun, Dec 08 2024, Ihor Radchenko <yantar92@posteo.net> wrote:
> >
> >> Benjamin McMillan <mcmillanbb@gmail.com> writes:
> >>
> >>> This outputs
> >>> #+RESULTS:
> >>> | (linenum:0, |
> >>> |           4 |
> >>>
> >>> I suppose the issue is the "linenum:0". In fact, running any of the
> test
> >>> src blocks does that, e.g.
> >>> #+begin_src maxima :results verbatim :batch batch
> >>> (assume(z>0),
> >>> integrate(exp(-t)*t^z, t, 0, inf));
> >>> #+end_src
> >>>
> >>> #+RESULTS:
> >>> #+begin_example
> >>> (linenum:0,
> >>> (assume(z > 0),integrate(exp(-t)*t^z,t,0,inf))
> >>>                                  gamma(z + 1)
> >>> #+end_example
> >>> This does not match the (should (equal ...)) in test-ob-maxima.el
> >>>
> >>> I don't know maxima, and haven't made any explicit modifications
> regards
> >>> it, so I don't know why my setup would be outputting linenum:0
>
> Benjamin,
> When you execute your source code block, ob-maxima prints the shell
> command as a message. Could you copy that shell command from *Messages*
> and send it, along with the batch file that ob-maxima creates?
>
> Thanks,
> Leo
>
> >>
> >> Setting linenum was introduced in
> >> https://list.orgmode.org/orgmode/87jzsrai3x.fsf@localhost/
> >>
> >> It clearly does not affect Linux, but Maxima on MacOS appears to have
> >> slightly different behavior.
> >>
> >> I am CCing the author of the original patch that introduced this
> setting.
> >> Leo, maybe you have some insight?
> >>
> >> Unless we can do something to solve the problem on Mac, I am tentatively
> >> inclined to revert the linenum part of the patch, so that ob-maxima is
> >> not broken on MacOS.
> >
> > Benjamin,
> > Could you include the output of
> >
> > #+begin_src maxima :results verbatim
> > build_info();
> > #+end_src
> >
> > , please? I think the bug is in the Mac build of Maxima, but I need more
> > information to figure it out.
> >
> > Best,
> > Leo