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To update an old system I had to compile python 2.7.14 with custom openssl version. The compiled system has no virtualenv binary and also neither pip nor easy_install for extension. How can I get virtualenv for the compiled version? How about pip?

3

From the docs on installing packages at https://packaging.python.org/tutorials/installing-packages/#ensure-you-can-run-pip-from-the-command-line there is a section on ensuring pip by running

/path_to_compiled_python/bin/python -m ensurepip --default-pip

which will install pip. You can then use it to install the virtualenv package with

/path_to_compiled_python/bin/pip install virtualenv
0

The steps that helped to setup a custom version of Python with a virtual environment without doing system wide installation.

Install dependencies:

sudo apt update
sudo apt install libssl-dev openssl g++ # and possibly more.

Get Python and build it:

wget https://www.python.org/ftp/python/3.8.8/Python-3.8.8.tgz
tar xzvf Python-3.8.8.tgz
cd Python-3.8.8
./configure
make

Install "pip" to "~/.local/lib/python3.8/site-packages":

./python -m ensurepip --default-pip
./python -m pip install --upgrade pip

Setup the virtual environment:

# Creates a directory "./python3.8-env".
./python -m venv python3.8-env

Activate the virtual environment and install other packages.

source python3.8-env/bin/activate
pip install --upgrade pip
pip install <package>

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