Try with this tutorial: https://pypanta.github.io/how-to-install-python-from-source-...

I also using Debian 11, and this is how I always install Python from source:

    wget https://www.python.org/ftp/python/3.11.0/Python-3.11.0b3.tgz

    tar xvzf Python-3.11.0b3.tgz
    cd Python-3.11.0b3.tgz

    sudo apt install libssl-dev zlib1g-dev libbz2-dev liblzma-dev libffi-dev tcl-dev libgdbm-dev libsqlite3-dev libreadline-dev tk tk-dev libmpdec-dev

    ./configure --enable-loadable-sqlite-extensions --enable-shared --with-lto --enable-optimizations --with-system-expat --with-system-ffi --with-computed-gotos --with-system-libmpdec --enable-ipv6 CC=x86_64-linux-gnu-gcc

    make
    sudo make altinstall

After that, I have a command "python 3.11" but when I try to run it, I get this:

python3.11: error while loading shared libraries: libpython3.11.so.1.0: cannot open shared object file: No such file or directory

My PS: https://pypanta.github.io/

I built it using CSS grid. It's not yet all finished, but now, I have more experience with CSS grid ;), so maybe I need to rewrite some parts again. And also, now CSS grid have a better support across browsers.

Slides are below the video. Click on "show more" to see them.

https://github.com/PyCon/2017-slides