Failed to build inflate64

[NewAtair]

Summary

Hello all,

uv fails to build

uv add -v py7zr

Detailed log: https://gist.github.com/NewAtair/c307de9fbe2f571233ced47f1ce02e08.js

Last lines of the log:

DEBUG Reverting changes to uv.lock
x Failed to build inflate64==1.0.1
|-> The build backend returned an error
-> Call to setuptools.build_meta.build_wheel` failed (exit code: 1)

  [stdout]
  running bdist_wheel
  running build
  running build_py
  copying src\inflate64\__init__.py -> build\lib.win-amd64-cpython-313\inflate64
  running egg_info
  writing src\inflate64.egg-info\PKG-INFO
  writing dependency_links to src\inflate64.egg-info\dependency_links.txt
  writing requirements to src\inflate64.egg-info\requires.txt
  writing top-level names to src\inflate64.egg-info\top_level.txt
  writing manifest file 'src\inflate64.egg-info\SOURCES.txt'
  reading manifest file 'src\inflate64.egg-info\SOURCES.txt'
  reading manifest template 'MANIFEST.in'
  adding license file 'COPYING'
  writing manifest file 'src\inflate64.egg-info\SOURCES.txt'
  copying src\inflate64\py.typed -> build\lib.win-amd64-cpython-313\inflate64
  running build_ext
  building 'inflate64._inflate64' extension

  [stderr]
  C:\Users\username\AppData\Local\uv\cache\builds-v0\.tmp9ZApHf\Lib\site-packages\setuptools_scm\git.py:310: UserWarning: git archive did not support describe output
    warnings.warn("git archive did not support describe output")
  C:\Users\username\AppData\Local\uv\cache\builds-v0\.tmp9ZApHf\Lib\site-packages\setuptools_scm\git.py:328: UserWarning: unprocessed git archival found (no export subst applied)
    warnings.warn("unprocessed git archival found (no export subst applied)")
  C:\Users\username\AppData\Local\uv\cache\builds-v0\.tmp9ZApHf\Lib\site-packages\setuptools\config\_apply_pyprojecttoml.py:82: SetuptoolsDeprecationWarning: `project.license` as
  a TOML table is deprecated
  !!

          ********************************************************************************
          Please use a simple string containing a SPDX expression for `project.license`. You can also use `project.license-files`. (Both options available on setuptools>=77.0.0).

          By 2026-Feb-18, you need to update your project and remove deprecated calls
          or your builds will no longer be supported.

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************

  !!
    corresp(dist, value, root_dir)
  C:\Users\username\AppData\Local\uv\cache\builds-v0\.tmp9ZApHf\Lib\site-packages\setuptools\config\_apply_pyprojecttoml.py:61: SetuptoolsDeprecationWarning: License classifiers
  are deprecated.
  !!

          ********************************************************************************
          Please consider removing the following classifiers in favor of a SPDX license expression:

          License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************

  !!
    dist._finalize_license_expression()
  C:\Users\username\AppData\Local\uv\cache\builds-v0\.tmp9ZApHf\Lib\site-packages\setuptools\dist.py:761: SetuptoolsDeprecationWarning: License classifiers are deprecated.
  !!

          ********************************************************************************
          Please consider removing the following classifiers in favor of a SPDX license expression:

          License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************

  !!
    self._finalize_license_expression()
  ERROR setuptools_scm._file_finders.git listing git files failed - pretending there aren't any
  warning: no previously-included files found matching '.gitignore'
  warning: no previously-included files found matching '.woodpecker.yml'
  no previously-included directories found matching 'ci'
  no previously-included directories found matching 'ISSUE_TEMPLATE'
  error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/

hint: This usually indicates a problem with the package or the build environment.
help: If you want to add the package regardless of the failed resolution, provide the --frozen flag to skip locking and syncing.
PS C:\Tools\Scripte\Python allgemein>

If run with

pip install --use-pep517 --no-cache --force-reinstall py7zr

than it is successful with:

Successfully installed brotli-1.1.0 inflate64-1.0.1 multivolumefile-0.2.3 psutil-7.0.0 py7zr-0.22.0 pybcj-1.0.6 pycryptodomex-3.22.0 pyppmd-1.1.1 pyzstd-0.17.0 texttable-1.7.0 typing-extensions-4.13.2

If I install py7zr with conda, there are no issues too.

So I'm a bit puzzled.

Platform

Windows 11 Version 23H2

Version

uv 0.7.3 (3c413f7 2025-05-07)

Python version

Python 3.13.3

[konstin]

Does pip use the same Python version as uv, and does pip also show building inflate64?

[NewAtair]

Hi,

according to:

PS C:\> pip --version pip 25.1.1 from C:\Users\username\AppData\Local\Programs\Python\Python312\Lib\site-packages\pip (python 3.12)

and here ist the log from

PS C:\> pip install --use-pep517 --no-cache --force-reinstall --verbose py7zr

https://gist.github.com/NewAtair/032810460f135775a4f0a8e8c5532208.js

So pip ist downloading and not building inflate64.

With Python 3.12 it is working:

PS C:\TEMP> mkdir test PS C:\TEMP> cd test PS C:\TEMP\test> uv venv --python 3.12 --seed PS C:\TEMP\test> .venv\Scripts\activate PS C:\TEMP\test> uv pip install --verbose py7zr

See Log: https://gist.github.com/NewAtair/6b9fd9519f59d497d04f711eedab8e75

This is very interesting, because with conda and Python 3.13.3 I don't have those issues.

Kind regard

[konstin]

Conda is a different ecosystem that uses its own prebuilt packages from a different build service. They may have Python 3.13 conda packages, but on PyPI, there are only wheels up to 3.12.

To use PyPI with uv/pip, you either need to downgrade to an older Python version (below 3.13) or follow the guidance in the error message and configure your machine for building the package:

error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/

[Ravencentric]

Upstream issue: miurahr/py7zr#640

[NewAtair]

General question (for a newbie): Wehen the update will be available?
To install Microsoft Visual C++ 14.0 is not a feasible solution.

Anyway, thank you for the clarification.

[konstin]

This is not a bug in uv, as the error message says, this is about for which platforms and Python versions inflate64 has wheel and how inflate64's build system works.

[NewAtair]

Maybe I'm was not clear enough before. I know that ist not a bug within uv so I have to wait for the updates further upstream for the updates of py7zr, inflate64, and ect.