[10.6.8] certbot & pyOpenSSL problems

[Bjarne D Mathiesen]

System Version: Mac OS X 10.6.8 (10K549)
Kernel Version: Darwin 10.8.0

Ok, I've got certbot installed, but a recent upgrade of something has
broken it :

#=> certbot certificates

gives the following error-message :

pkg_resources.ContextualVersionConflict: (cryptography 2.9.2
(/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages),
Requirement.parse('cryptography>=3.3'), {'PyOpenSSL'})

which to me indicates, that PyOpenSSL needs to be upgraded.
So, I installed py39-pip, and did the following :

#=> pip install pyopenssl
Requirement already satisfied: pyopenssl in
/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages
(21.0.0)
Collecting cryptography>=3.3
  Downloading cryptography-36.0.1.tar.gz (572 kB)
     |████████████████████████████████| 572 kB 1.0 MB/s
  Installing build dependencies ... done

which resulted in the following error-message :

  running build_rust

      =============================DEBUG
ASSISTANCE=============================
      If you are seeing a compilation error please try the following
steps to
      successfully install cryptography:
      1) Upgrade to the latest pip and try again. This will fix errors
for most
         users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
      2) Read https://cryptography.io/en/latest/installation/ for specific
         instructions for your platform.
      3) Check our frequently asked questions for more information:
         https://cryptography.io/en/latest/faq/
      4) Ensure you have a recent Rust toolchain installed:
         https://cryptography.io/en/latest/installation/#rust

      Python: 3.9.9
      platform: macOS-10.6.8-i386-64bit
      pip: n/a
      setuptools: 59.6.0
      setuptools_rust: 1.1.2
      =============================DEBUG
ASSISTANCE=============================

  error: can't find Rust compiler

So, it's missing the rust compiler !
OK, let me install that one :

--->  Fetching distfiles for rust-compiler-wrap
Error: rust is only supported on macOS 10.7 or later.
Error: Failed to fetch rust-compiler-wrap: unsupported platform version
Error: See
/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_rust/rust-compiler-wrap/main.log
for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe
there is a bug.
Error: Processing of port rust failed


Any ideas as to how I can upgrade PyOpenSSL -or- the cryptography ?
Or am I just lost ???


-- 
Bjarne D Mathiesen
Korsør ; Danmark ; Europa
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