@compu42 Can you sign-off on your commit? Thanks!

Using Fedora 33 on ARM, I can confirm that libpq-devel and python3-devel are required for pip install -e '.[all,test,lint]' to succeed.

Attempting to pip install --no-binary ':all:' -e '.[all,test,lint]' reveals further dependencies on libxml2-devel and libxslt-devel.

It also trips over matrix-org/python-unpaddedbase64#4: our unpaddedbase64 library doesn't provide a source distribution.

And a few dependencies need wheel installed so that bdist_wheel is available when building.

I did not need to explicitly install tk-devel or redhat-rpm-config, which were introduced years ago in d7739c4 and 5325455 respectively.

I'll tidy those up and get this merged.

Upon looking more closely at install.md, we have lots of very, very outdated and ill-maintained information in there.

We should probably purge it and move most distro-specific information to the GitHub wiki or similar.

I've continued this, cleaned it up, and pushed an additional commit over at #9322. Thank you, @compu42 !