Version 0.8.1 is available upstream. Please consider updating!
It seems that version 0.8.1 is available upstream, while the latest version in the Gentoo tree is 0.7. You think this warning is false? Read more about it here.
citeproc parses CSL style files and uses them to
generate a list of formatted citations and bibliography
entries. For more information about CSL, see
<https://citationstyles.org/>.