Can't build with Python v3.13

[endlisnis]

I'm trying to install this with Python3.13. After many iterations to get the prerequisites installed, I finally got to this compilation failure:

      Compiling src/ext/g2clib.pyx because it changed.
      [1/1] Cythonizing src/ext/g2clib.pyx
      building 'grib2io.g2clib' extension
      creating build/temp.linux-x86_64-cpython-313/src/ext
      gcc -fno-strict-overflow -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -fcf-protection -fexceptions -fcf-protection -fexceptions -fcf-protection -fexceptions -O3 -fPIC -I/usr/local/include -I/tmp/pip-build-env-tv0ft7wn/overlay/lib64/python3.13/site-packages/numpy/_core/include -I/usr/include/python3.13 -c src/ext/g2clib.c -o build/temp.linux-x86_64-cpython-313/src/ext/g2clib.o
      src/ext/g2clib.c: In function ‘__pyx_f_7grib2io_6g2clib__toarray’:
      src/ext/g2clib.c:3224:10: error: implicit declaration of function ‘PyObject_AsWriteBuffer’; did you mean ‘PyObject_GetBuffer’? [-Wimplicit-function-declaration]
       3224 |   (void)(PyObject_AsWriteBuffer(__pyx_v_a, (&__pyx_v_abuf), (&__pyx_v_buflen)));
            |          ^~~~~~~~~~~~~~~~~~~~~~
            |          PyObject_GetBuffer
      src/ext/g2clib.c: In function ‘__pyx_pf_7grib2io_6g2clib_10unpack7’:
      src/ext/g2clib.c:5601:10: error: implicit declaration of function ‘PyObject_AsReadBuffer’; did you mean ‘PyObject_GetBuffer’? [-Wimplicit-function-declaration]
       5601 |   (void)(PyObject_AsReadBuffer(__pyx_v_drtmpl, (&__pyx_v_drtmpldat), (&__pyx_v_buflen)));
            |          ^~~~~~~~~~~~~~~~~~~~~
            |          PyObject_GetBuffer
      error: command '/usr/bin/gcc' failed with exit code 1
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for grib2io
Failed to build grib2io
ERROR: Failed to build installable wheels for some pyproject.toml based projects (grib2io)

I'm trying to install this inside a podman container running Fedora 41, which comes with Python3.13.

I asked GrokAI about this failure, and it says:

The error message you're encountering is due to an implicit declaration of the function PyObject_AsWriteBuffer, which has been deprecated and removed in newer versions of Python. Here's how you can address this issue:

Solution:

Replace PyObject_AsWriteBuffer with Py_buffer and PyObject_GetBuffer:

[john970]

I'm running into the same issue, which is confusing as I believe those cython functions were removed in 3.10.

[EricEngle-NOAA]

Hi @endlisnis and @john970 - this is more of a grib2io build issue. This is a known issue. Apologies that the grib2io README says 3.8+ -- I never updated to 3.8 - 3.12.

Anyways...I am actively working on this. See NOAA-MDL/grib2io#156 and https://github.com/NOAA-MDL/grib2io/tree/refactor-g2clib-cython

[EricEngle-NOAA]

This issue can be closed here.