Thank you very much Dima.

Trying to run
sudo apt-get libffi-dev xz-utils liblzma-dev 
I get
E: Invalid operation libffi-dev

Installing the dependencies from the link you provided doesn't get me any 
error.

Running ./configure gets me the following message:
real_configure:

    hint: installing the following system packages, if not
    already present, is recommended and may avoid having to
    build them (though some may have to be built anyway):

      $ sudo apt-get update
      $ sudo apt-get install meson python3 libpython3-dev 
python3-setuptools python3-venv

Does this mean that python3 is still non recognised?
When running
sudo apt-get install meson python3 libpython3-dev python3-setuptools 
python3-venv 
the only to be installed is meson.

Rerunning ./configure I see the following lines in the output:
python3:                        no suitable system package; standard, SPKG 
version 3.12.5 is already installed
python_build:                   no; standard, SPKG version 1.2.1 will be 
installed
setuptools:                     no; standard, SPKG version 73.0.1 will be 
installed
meson:                          no suitable system package; standard, SPKG 
version 1.7.0 will be installed
meson_python:                   no; standard, SPKG version 0.17.1 will be 
installed
liblzma:                        SPKG version 5.2.5 is already installed
libffi:                         SPKG version 3.4.6 is already installed
xz:                             SPKG version 5.2.5 is already installed

I hope I was clear enough.
Thank you for your time, I really appreciate the help.

Best regards,
Léon

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