ERROR: Could not build wheels for opencv-python which use PEP 517 and cannot be installed directly

Question

前提・実現したいこと

pipenv install時に以下のようなエラーが出て困っています。
調べて書いていたことはあらかた試してみましたが、結果は変わらないです。
わかる方がいましたら、コメントお願いします。

発生している問題・エラーメッセージ

$ pipenv install opencv-python
Installing opencv-python…
Error:  An error occurred while installing opencv-python!
Error text: Collecting opencv-python
  Using cached opencv-python-4.4.0.44.tar.gz (88.9 MB)
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
    Preparing wheel metadata: started
    Preparing wheel metadata: finished with status 'done'
Collecting numpy>=1.17.3
  Using cached numpy-1.19.3-cp38-cp38-manylinux2014_aarch64.whl (12.4 MB)
Building wheels for collected packages: opencv-python
  Building wheel for opencv-python (PEP 517): started
  Building wheel for opencv-python (PEP 517): finished with status 'error'
Failed to build opencv-python

  ERROR: Command errored out with exit status 1:
   command: /home/ubuntu/.local/share/virtualenvs/hoge-B1I62z_H/bin/python /home/ubuntu/.local/share/virtualenvs/hoge-B1I62z_H/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /tmp/tmp_rca2162
       cwd: /tmp/pip-install-7pokbvih/opencv-python
  Complete output (9 lines):
    File "/tmp/pip-build-env-n7q4o_jo/overlay/lib/python3.8/site-packages/skbuild/setuptools_wrap.py", line 560, in setup
      cmkr = cmaker.CMaker(cmake_executable)
    File "/tmp/pip-build-env-n7q4o_jo/overlay/lib/python3.8/site-packages/skbuild/cmaker.py", line 95, in __init__
      self.cmake_version = get_cmake_version(self.cmake_executable)
    File "/tmp/pip-build-env-n7q4o_jo/overlay/lib/python3.8/site-packages/skbuild/cmaker.py", line 81, in get_cmake_version
      raise SKBuildError(
  Traceback (most recent call last):
  
  Problem with the CMake installation, aborting build. CMake executable is cmake
  ----------------------------------------
  ERROR: Failed building wheel for opencv-python
ERROR: Could not build wheels for opencv-python which use PEP 517 and cannot be installed directly

✘ Installation Failed

試したこと

pipのバージョンダウングレード
pip install cmake
pipのupgrade

$ sudo apt-get install python-opencv
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package python-opencv

補足情報（FW/ツールのバージョンなど）

Ubuntu 20.04.1
python 3.8.5
pip 20.2.4
マシン：ラズパイ４

Answer 1

ERROR: Could not build wheels for opencv-python ...

このスレッドによるとARMアーキテクチャでは cmake の問題で OpenCV のビルドに失敗するようです。
この中で紹介されている、

Install OpenCV-Python in Ubuntu

$ sudo apt-get install python-opencv

このコマンドでビルド済みのパッケージのインストールではいかがでしょうか。

Comments

[aiai8976]

追記したので確認お願いします。

[退会済みユーザー]

ご確認および追記ありがとうございます。

```
$ sudo apt update
$ sudo apt install python3-opencv
```
この手順でいかがでしょうか。