MarsSeed [1] filed a deletion request for openmodelica-dev-omc [2]: 6 year old dev package, upstream repo archived since 2019. [a]
Only other, similarly defunct and old dev packages depend on this. Upstream seems to have migrated to a new monorepo, and no longer releases unstable/preview snapshots, only stable tags and nightly builds. [a]: https://github.com/OpenModelica/OMCompiler [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/openmodelica-dev-omc/
