How to uninstall packages that were installed as dependency but are no longer required

[Yasuhiro Kimura]

Hello,

If you repeat the update of installed Cygwin packages for a while,
it's quite possible that there are some packages that were installed
as dependency but are no longer required by any others.

Then is there any way to detect and uninstall such ones?

I expect such way as `apt autoremove` of Debian or `dnf autoremove` of
Fedora.

Best Regards.

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Yasuhiro Kimura