[Bug 281041] graphics/py-cairo: py39-cairo and py311-cairo conflict with each other via py3cairo.h

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281041

--- Comment #3 from Jim D. <radicleparticles@gmail.com> ---
Starting with fresh installation of FBSD-14.1 on local (home built) host, I
installed desired/needed applications either as locally compiled or pkg install
where local compile encountered errors (such as noted above).

I don't remember the exact sequence of (12 hours of) events but believe that
py311 was installed as a dependency before py39 was later required as a
dependency. Not knowing when a particular package requires 39 and won't work
with an intalled 311 is not something that I have ever spent time
pre-researching and trying to find a (preventative) solution.

When looking at pages of previous FBSD version package/application
installations, I would start with a compile to get the best "fit" for my
particular HW, and then do pkg if the compile failed.

I have no need nor intention of retaining py39 as "default", yet some packages
require it and then "run afoul" of a prevously installed py311. This is the
"old leap-frog" problem.

Again - not knowing in advance about which applications require python and
looking to see if there are/were any "remedial patches" for FBSD/pkg dealing
with multiple versions of a dependent python, the attempted installation of
dependency py39-cairo problem came as a surprise.

I am not sure how best to provide useful after-affect guidance for such
situations. There is nothing noted in the 14.1 Release notes, and whilst I
usually at least peruse said documents, I am not looking for things that I
don't know that will be a dependency.

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