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

If you run a (recent) Linux, and you type `pngcheck` (with no arguments) what version number do you get?

None, command not found

@Kerplunk Thanks, I hd planned to add that option but apparently polls have only four options.