In order to fully get rid of the old polynomialCurves2d stuff, please also fix octave_pkg/index.sh, using something like the patch attached to this comment.

(file #56511)

I had a brief look.
All that is needed is removing "polynomialCurves2d" from the subdirlist in __matgeom_package_register__.m .

Patch attached, incl. some style fixes.
Maybe/hopefully it can be morphed into an mxe-octave cset.

Looking at upstream matGeom (https://github.com/mattools/matGeom/tree/master/matGeom), it is a bit of a hodgepodge with some really old content; e.g., file 'Contents.m' is from 2017 and not up-to date with current matgeom (matGeom) contents. Little wonder this buglet slipped through if  __matgeom_package_register__.m was based on it.



(file #55944)

Loading the matgeom-1.2.4 package yields an error about a missing subdirectory:

:
warning: addpath: C:\Programs\Octave\Octave-9.1.1_0403-OS\mingw64\share\octave\packages\matgeom-1.2.4\polynomialCurves2d: The system cannot find the file specified.

warning: called from
    __matgeom_package_register__ at line 41 column 5
    C:\Programs\Octave\Octave-9.1.1_0403-OS\mingw64\share\octave\packages\matgeom-1.2.4\PKG_ADD at line 1 column 1
    load_packages_and_dependencies at line 56 column 5
    load_packages at line 53 column 3
    pkg at line 639 column 7
    C:\Users\philip\.octaverc at line 42 column 1
:

(matgeom gets loaded as a dependency when mapping loads geometry that in turn loads matgeom)
That subdirectory was still in matgeom-1.2.3.
This error message is from octave-9.1.1 from octave.space (octave-2024-04-03-04-39-release-w64-64-installer.exe) but I also get it in my own crossbuilds.