pyaudioインストール時、portaudio.h が見つからない

M1 mac 特有ではないと思うのですが、 pyaudio をインストールするときに portaudio.h が見つからないというエラーでインストールできなかったので、解決策をメモします。

brew install portaudio

# あらかじめ portaudio.h やライブラリが指定のパスに存在することを確認済み
python -m pip install --global-option='build_ext' --global-option='-I/opt/homebrew/include' --global-option='-L/opt/homebrew/lib' pyaudio

WARNING: Disabling all use of wheels due to the use of --build-option / --global-option / --install-option.
Collecting pyaudio
  Using cached PyAudio-0.2.12.tar.gz (42 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: pyaudio
  Building wheel for pyaudio (pyproject.toml) ... error
  error: subprocess-exited-with-error
  
  × Building wheel for pyaudio (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [10 lines of output]
      running bdist_wheel
      running build
      running build_py
      running build_ext
      building '_portaudio' extension
      src/_portaudiomodule.c:31:10: fatal error: 'portaudio.h' file not found
      #include "portaudio.h"
               ^~~~~~~~~~~~~
      1 error generated.
      error: command '/usr/bin/clang' failed with exit code 1
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for pyaudio
Failed to build pyaudio
ERROR: Could not build wheels for pyaudio, which is required to install pyproject.toml-based projects

多くの解説がこれでインストールできるとあるのですが、私はできませんでした。

解決策として、 ${HOME}/.pydistutils.cfg に次の３行を定義

[build_ext]
include_dirs=/opt/homebrew/include
library_dirs=/opt/homebrew/lib

この後 pyaudio がインストールできました。

(venv) pip install pyaudio        
Collecting pyaudio
  Using cached PyAudio-0.2.12.tar.gz (42 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: pyaudio
  Building wheel for pyaudio (pyproject.toml) ... done
  Created wheel for pyaudio: filename=PyAudio-0.2.12-cp38-cp38-macosx_10_14_arm64.whl size=37717 sha256=.......
  Stored in directory: /Users/xxxxxx/Library/Caches/pip/wheels/......
Successfully built pyaudio
Installing collected packages: pyaudio
Successfully installed pyaudio-0.2.12