How to install Python pip packages when Python is built from source?

Question

Python

There was a need to install a second Python interpreter. There is one installed from the official site (installation package for macOS), but there is a need for a second interpreter. Needed, in particular, because of the Numba compiler.

Installed Python 3.8.6 on macOS from sources.

spoiler

$ mkdir .python
$ cd .python 
$ wget https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tgz
$ tar zxvf Python-3.8.6.tgz
$ cd Python-3.8.6
$ ./configure --enable-optimixation --prefix=*path/to/.python*
$ sudo make
$ sudo make altinstall

Python itself is fully functional, runs Shell, you can run various scripts through it, you can even create a virtual environment. But when the question arose about the need to install an external package, then through pip3.8, which became along with Python, it gave the following error that (as I understand it) pip3.8 is configured locally and it does not see something.

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WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, 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/numba/
WARNING: Retrying (Retry(total=3, 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/numba/
WARNING: Retrying (Retry(total=2, 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/numba/
WARNING: Retrying (Retry(total=1, 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/numba/
WARNING: 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/numba/
Could not fetch URL https://pypi.org/simple/numba/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/numba/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping
ERROR: Could not find a version that satisfies the requirement numba (from versions: none)
ERROR: No matching distribution found for numba
WARNING: 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

Good people, tell me, please, how to solve this problem. Thank you.

PS I googled this problem on the Internet, but I did not find a clear answer.

Answer 1

Apparently the error is that there is no SSL - "Can't connect to HTTPS URL because the SSL module is not available."
You need to either install openssl or fix the path