If you run a (recent) Linux, and you type `pngcheck` (with no arguments) what version number do you get? Feel free to respond with your Linux distro, if you want.
4.0.1
4.0.0
3.0.3
earlier than 3.0.3
Poll ends at .
@svgeesus Fedora 43 offers to install 4.0.1 after "command not found"
on a Debian 13 server, the package available is 3.0.3