Failure to build on Mac missing zlib header

[aray-openai]

The same installation command that works for pillow fails for pillow-simd, which is surprising to me

What did you do?

Try to install pillow: works

pip uninstall -y pillow
pip install -U --force-reinstall pillow

Try to install pillow-simd: fails

pip uninstall -y pillow
pip install -U --force-reinstall pillow-simd

What did you expect to happen?

Both installations work

What actually happened?

  running build_ext


  The headers or library files could not be found for zlib,
  a required dependency when compiling Pillow from source.

  Please see the install instructions at:
     https://pillow.readthedocs.io/en/latest/installation.html

  Traceback (most recent call last):
    File "/private/var/folders/2f/g5fwh_n57jl77kkpfb4jvm440000gn/T/pip-install-pf0cql2q/pillow-simd/setup.py", line 900, in <module>
      zip_safe=not (debug_build() or PLATFORM_MINGW),
    File "/Users/aray/.pyenv/versions/3.7.7/envs/z/lib/python3.7/site-packages/setuptools/__init__.py", line 145, in setup
      return distutils.core.setup(**attrs)
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/core.py", line 148, in setup
      dist.run_commands()
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/dist.py", line 966, in run_commands
      self.run_command(cmd)
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/Users/aray/.pyenv/versions/3.7.7/envs/z/lib/python3.7/site-packages/wheel/bdist_wheel.py", line 204, in run
      self.run_command('build')
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/command/build.py", line 135, in run
      self.run_command(cmd_name)
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/Users/aray/.pyenv/versions/3.7.7/lib/python3.7/distutils/command/build_ext.py", line 340, in run
      self.build_extensions()
    File "/private/var/folders/2f/g5fwh_n57jl77kkpfb4jvm440000gn/T/pip-install-pf0cql2q/pillow-simd/setup.py", line 687, in build_extensions
      raise RequiredDependencyException(f)
  __main__.RequiredDependencyException: zlib

What are your OS, Python and Pillow versions?

• OS: Mac OS X 10.14.2
• Python: 3.7.7 (built w/ pyenv & pyenv-virtualenv)
• Pillow: 7.0.0, and 7.0.0.post3 for pillow-simd

[homm]

The same installation command that works for pillow fails for pillow-simd

This is because Pillow provides binary packages, while Pillow-SIMD not. You need to install all prerequisites first.