zstd missing from Python 3.14

[adrienyhuel]

Hello,

It seems your build of cpython is missing zstd as build dependency.

The consequence is that zstd is not available in standard python compression module, and it breaks compatibility against some libraries, like aiohttp.

Though aiohttp is fxing that issue by making zstd import optional (aio-libs/aiohttp#11603), it would be good if your cpython build include zstd natively, like windows and most linux distributions

Here is the error I encounter in a wolfi container with python 3.14 :

cc351d0d181f:/usr/lib/python3.14# python
Python 3.14.0 (tags/v3.14.0-1-g21e1080-dirty:21e1080, Oct 10 2025, 14:04:19) [GCC 15.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import aiohttp
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    import aiohttp
  File "/usr/lib/python3.14/site-packages/aiohttp/__init__.py", line 6, in <module>
    from .client import (
    ...<42 lines>...
    )
  File "/usr/lib/python3.14/site-packages/aiohttp/client.py", line 40, in <module>
    from . import hdrs, http, payload
  File "/usr/lib/python3.14/site-packages/aiohttp/http.py", line 7, in <module>
    from .http_parser import (
    ...<6 lines>...
    )
  File "/usr/lib/python3.14/site-packages/aiohttp/http_parser.py", line 29, in <module>
    from .compression_utils import (
    ...<5 lines>...
    )
  File "/usr/lib/python3.14/site-packages/aiohttp/compression_utils.py", line 25, in <module>
    import compression.zstd  # noqa: I900
    ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.14/compression/zstd/__init__.py", line 29, in <module>
    import _zstd
ModuleNotFoundError: No module named '_zstd'

[adrienyhuel]

I can add those informations if that can help :

ef19bde84a9b:/# python3 -m sysconfig | grep -i zstd
        HAVE_ZSTD_H = "0"
        MODULE__ZSTD_DEPS = "./Modules/_zstd/_zstdmodule.h ./Modules/_zstd/buffer.h ./Modules/_zstd/zstddict.h"
        MODULE__ZSTD_STATE = "missing"
        SRCDIRS = "Modules   Modules/_ctypes   Modules/_decimal   Modules/_decimal/libmpdec   Modules/_hacl   Modules/_io   Modules/_multiprocessing   Modules/_sqlite   Modules/_sre   Modules/_testcapi   Modules/_testinternalcapi   Modules/_testlimitedcapi   Modules/_xxtestfuzz   Modules/_zstd   Modules/cjkcodecs   Modules/expat   Objects   Objects/mimalloc   Objects/mimalloc/prim   Parser   Parser/tokenizer   Parser/lexer   Programs   Python   Python/frozen_modules"

[sergiodj]

Thank you for creating an issue, @adrienyhuel! I'm working on it and should have a PR ready soon (I'm also working on other stuff right now, so I'm kinda slow...). Stay tunned! :)