MarsSeed [1] filed a deletion request for hdf5_18 [2]: Unused, unneeded legacy version from 2018.
Safe to drop after the deletion of the broken, unbuildable yorick- hdf5-git (PRQ#58954), which has been EOL for 5 years. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/hdf5_18/
