[bogantech]

From the image: "Operating systems known to have run curl"

How many of them are supported in mainline Curl, aren't POSIX and aren't dead operating systems?

[einr]

The mainline curl repository* maintains code for supporting OS/400, AmigaOS, RISC OS, MS-DOS, Mac OS 9, and more that aren't even remotely POSIX.

What is a dead operating system anyway, and how is that relevant to the point that Windows is the hardest OS to maintain support for?

* See for instance the config-*.h files in https://github.com/curl/curl/tree/1c567f797bce0befce109bceac...

[bogantech]

> What is a dead operating system anyway

No longer maintained / barely changing, like MS-DOS, Mac OS 9, Amiga OS (which does occasionally get an update but usually not much in the way of core changes)

It's relevant because Windows is a moving target and the dead operating systems aren't so there's not a lot of support work needed for them nor will there be as much of a user base.