CentOS 7でmysqlclientをpip3でインストールする方法

Centos PYTHON3 チュートリアル

CentOS 7でmysqlclientをpip3でインストールしようとしたときに、互換性の問題が発生することがあります。特に、mysqlclientのバージョン2.0.2がCentOS 7と互換性がないため、インストールに失敗することがあります。この問題を解決するための方法を以下に説明します。

以下のようなエラーが発生する場合があります:

pip3 install mysqlclient
Collecting mysqlclient
  Using cached mysqlclient-2.2.4.tar.gz (90 kB)
  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
  ╰─> [27 lines of output]
      Trying pkg-config --exists mysqlclient
      Command 'pkg-config --exists mysqlclient' returned non-zero exit status 1.
      Trying pkg-config --exists mariadb
      Command 'pkg-config --exists mariadb' returned non-zero exit status 1.
      Trying pkg-config --exists libmariadb
      Command 'pkg-config --exists libmariadb' returned non-zero exit status 1.
      Traceback (most recent call last):
        File "/usr/local/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "/usr/local/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/usr/local/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
                 ^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-3i_ec6o7/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 325, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=['wheel'])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-3i_ec6o7/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 295, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-3i_ec6o7/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 311, in run_setup
          exec(code, locals())
        File "<string>", line 155, in <module>
        File "<string>", line 49, in get_config_posix
        File "<string>", line 28, in find_package_name
      Exception: Can not find valid pkg-config name.
      Specify MYSQLCLIENT_CFLAGS and MYSQLCLIENT_LDFLAGS env vars manually
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

方法1: CFLAGS環境変数を設定してからインストールする

CFLAGS環境変数の設定

まず、CFLAGS環境変数を設定します。これにより、コンパイラが適切な標準を使用するように指示します。

export CFLAGS="-std=c99"

mysqlclientのインストール

CFLAGSを設定した後で、mysqlclientを再インストールします。

pip3 install mysqlclient

結果:

pip3 install mysqlclient
Collecting mysqlclient==2.2.4
  Downloading mysqlclient-2.2.4.tar.gz (90 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 90/90 kB 526.4 kB/s eta 0:00:00
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: mysqlclient
  Building wheel for mysqlclient (pyproject.toml) ... done
...
Successfully built mysqlclient
Installing collected packages: mysqlclient
Successfully installed mysqlclient-2.2.4
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv

方法2: mysqlclientの古いバージョン(2.0.1)をインストールする

mysqlclientのバージョン2.0.1をインストール

最新バージョンではなく、互換性のあるバージョン2.0.1をインストールします。

pip3 install mysqlclient==2.0.1

結果:

Building wheels for collected packages: mysqlclient
  Building wheel for mysqlclient (pyproject.toml) ... done
  Created wheel for mysqlclient: filename=mysqlclient-2.0.1-cp311-cp311-linux_x86_64.whl size=99155 sha256=2ca7f0039e4aecce198e3980da64bfd7a7152882c4a11715cd435cac8479c803
  Stored in directory: /root/.cache/pip/wheels/03/23/0e/db44c43d8e8291c2c5769c7c611ad4581d29cc73e6b60db5f5
Successfully built mysqlclient
Installing collected packages: mysqlclient
Successfully installed mysqlclient-2.0.1

 

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