Hi!

While rebuilding the python related packages against the Python 3.15rc2
version we found that numcodecs fails to build from source [1].

The error is:
env PYTHONPATH=/build/reproducible-path/numcodecs-0.17.0+ds/.pybuild/cpython3_3.15_numcodecs/build /build/reproducible-path/numcodecs-0.17.0+ds/.pybuild/cpython3_3.14_numcodecs/build \
     http_proxy='http://127.0.0.1:9/' https_proxy='https://127.0.0.1:9/' \
python3 -m sphinx -N -E -T -b html . /build/reproducible-path/numcodecs-0.17.0+ds/.pybuild/docs/html/
env: ‘/build/reproducible-path/numcodecs-0.17.0+ds/.pybuild/cpython3_3.14_numcodecs/build’: Permission denied

The solution is to fix the pythonpath variable when generating docs, add
-i python3 to the pybuild invocation.

I've applied the fix in the sandbox [2] to verify that it builds
successfully, please consider applying the patch to support the upcoming
3.15 version.

Setting the severity to important for now. Once Python 3.15 is released,
it will be added to python3-defaults and this bug will become release
critical.

Happy hacking,

[1]: https://debusine.debian.net/debian/r-python-python3.15/artifact/4784352/
[2]: https://debusine.debian.net/debian/r-python-python3.15/

We believe that the bug you reported is fixed in the latest version of
numcodecs, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1148793@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Antonio Valentino <antonio.valentino@tiscali.it> (supplier of updated numcodecs package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 26 Sep 2026 09:38:49 +0000
Source: numcodecs
Architecture: source
Version: 0.17.0+ds-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Antonio Valentino <antonio.valentino@tiscali.it>
Closes: 1148793
Changes:
 numcodecs (0.17.0+ds-2) unstable; urgency=medium
 .
   * debian/rules:
     - Deal with multiple python supported versions (Closes: #1148793).
       Patch provided by Maximiliano Curia.
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