MarsSeed [1] filed a deletion request for evolution-etesync-legacy
[2]:
Etesync (etesync-git) fails to build and is a legacy component
discontinued 4 years ago. [a]
Not useful to keep this obsolete plugin version.
Working successor is AUR/evolution-etesync{,-git} [b], which, despite
keeping its original name, relies on the etesync's maintained
successor, (lib)etebase.
[a]: https://github.com/etesync/etebase-rs/tree/legacy
[b]: https://aur.archlinux.org/packages?K=evolution-etesync
[1] https://aur.archlinux.org/account/MarsSeed/
[2] https://aur.archlinux.org/pkgbase/evolution-etesync-legacy/
