M2macでmanimがインストールできない

M2Macのvenv上で以下のエラーに遭遇

...
manimpango.c:773:10: fatal error: 'cairo.h' file not found
      #include "cairo.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 manimpango
  Building wheel for pycairo (pyproject.toml) ... error
  error: subprocess-exited-with-error
  
  × Building wheel for pycairo (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [12 lines of output]
      running bdist_wheel
      running build
      running build_py
      creating build
      creating build/lib.macosx-13-arm64-cpython-311
      creating build/lib.macosx-13-arm64-cpython-311/cairo
      copying cairo/__init__.py -> build/lib.macosx-13-arm64-cpython-311/cairo
      copying cairo/__init__.pyi -> build/lib.macosx-13-arm64-cpython-311/cairo
      copying cairo/py.typed -> build/lib.macosx-13-arm64-cpython-311/cairo
      running build_ext
      'pkg-config' not found.
      Command ['pkg-config', '--print-errors', '--exists', 'cairo >= 1.15.10']
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for pycairo
Failed to build manimpango pycairo
ERROR: Could not build wheels for manimpango, pycairo, which is required to install pyproject.toml-based projects

解決法

1.まず以下の公式のRequirementをインストールしたか確認

2.以下のページで言われてることをやったが、解決しなかった。

この間に
brew install Cython
を実行

3.pkg-configをインストール。

最初のエラーをよく見ると 'pkg-config' not found.とある。
よって
brew install pkg-config
を実行したのちに
pip install manimを行ったらうまくインストールできた。