Version 4.22 is available upstream. Please consider updating! It seems that version 4.22 is available upstream, while the latest version in the Gentoo tree is 4.20. You think this warning is false? Read more about it here.
fitsverify is a computer program that rigorously checks whether a
FITS format data file conforms to all the requirements defined in
the FITS (Flexible Image Transport System) standard document.