MarsSeed [1] filed a deletion request for oce [2]: Broken fork of opencascade (in [extra]), EOL since 2021, unbuildable on Arch since 2022.
Consumer AUR/chronoengine-git no longer needs this; its upstream is directly compatible with opencascade. (Notified the maintainer; otherwise the latter package has 0 pkgstats and no user comments.) [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/oce/
