MarsSeed [1] filed a deletion request for lib32-ilmbase [2]: Can be deleted, Arch ilmbase package doesn't exist anymore and is replaced by openexr package. AUR has lib32-openexr.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lib32-ilmbase/
