Failed to build 'Pillow' when getting requirements to build wheel

[andreaxhearts]

Python --verison
Python 3.14.2

 python -m pip install toasted
Collecting toasted
  Using cached toasted-0.2.0-py3-none-any.whl.metadata (9.2 kB)
Collecting httpx~=0.25.0 (from toasted)
  Using cached httpx-0.25.2-py3-none-any.whl.metadata (6.9 kB)
Collecting Pillow~=10.2.0 (from toasted)
  Using cached pillow-10.2.0.tar.gz (46.2 MB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error

  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [21 lines of output]
      Traceback (most recent call last):
        File "... AppData\Local\Python\pythoncore-3.14-64\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 389, in <module>
          main()
          ~~~~^^
        File "... AppData\Local\Python\pythoncore-3.14-64\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 373, in main    
          json_out["return_val"] = hook(**hook_input["kwargs"])
                                   ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
        File "... AppData\Local\Python\pythoncore-3.14-64\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 143, in get_requires_for_build_wheel 
          return hook(config_settings)
        File "... AppData\Local\Temp\pip-build-env-3aciu1sx\overlay\Lib\site-packages\setuptools\build_meta.py", line 331, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=[])
                 ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "... AppData\Local\Temp\pip-build-env-3aciu1sx\overlay\Lib\site-packages\setuptools\build_meta.py", line 301, in _get_build_requires
          self.run_setup()
          ~~~~~~~~~~~~~~^^
        File "... AppData\Local\Temp\pip-build-env-3aciu1sx\overlay\Lib\site-packages\setuptools\build_meta.py", line 317, in run_setup
          exec(code, locals())
          ~~~~^^^^^^^^^^^^^^^^
        File "<string>", line 31, in <module>
        File "<string>", line 28, in get_version
      KeyError: '__version__'
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'Pillow' when getting requirements to build wheel

(Latest version of Pillow is 12.0.0 and also is installed. Same error happened with Python 3.13.)

[NebularNerd]

My PR #7 resolves this, the installer is trying to use older versions of the httpx and pillow libraries. Until the next release is made you can download the source, unpack to a folder and install using pip install -e . from a command/terminal prompt inside the unpacked source folder.

[ysfchn]

Pillow 10.2.0 doesn't seem to work with Python 13. python-pillow/Pillow#8089

What you can do is to install a higher version of Pillow first and then install toasted without dependencies.

python -m pip install "Pillow==10.4.0" "httpx~=0.25.0" "winsdk~=1.0.0b6"
python -m pip install --no-deps toasted

It should be fixed in next release, but I wouldn't recommend installing from source right now since it is unstable and contains work-in-progress stuff, so the best way is to use the previously released versions.