pip install 時のエラー（pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.）

発生したエラーについて

エラーの本文

Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.",)': /simple/pip/
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.",)) - skipping
Requirement already up-to-date: pip in /usr/local/lib/python3.6/site-packages (18.1)
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.",)) - skipping

環境

• Docker version 20.10.12, build e91ed57
  • Dockerイメージ　nvidia/cuda:11.3.1-cudnn8-devel
• Python3.6.13

エラーの発生手順

コンテナ内でPython3.6を利用する必要があり、下記リポジトリをcloneしてREADMEの手順通りにインストールを実行。

./configure
make
make test
sudo make install

その後、pip installを実行するとSSLに関するエラーが発生。

対処法

libssl-devをインストールする。

apt-get install libssl-dev

参考サイト