Version 0.2.1 is available upstream. Please consider updating! It seems that version 0.2.1 is available upstream, while the latest version in the Gentoo tree is 0.1.14. You think this warning is false? Read more about it here.
This library allows reading and writing gzip-compressed JSON catalog files,
which can be used to store GPG, PKCS-7 and SHA-256 checksums for each file.
This provides equivalent functionality to the catalog files supported
in Microsoft Windows.