zoopp [1] filed a deletion request for cppformat [2]: The name of the project has been changed a longtime ago to fmtlib (https://github.com/fmtlib/fmt). Moreover, latest version is 3.0.1 so this package seems pretty much abandoned.
[1] https://aur.archlinux.org/account/zoopp/ [2] https://aur.archlinux.org/pkgbase/cppformat/
