MarsSeed [1] filed a deletion request for lib32-ppl [2]: This 32-on-64-bit library is not needed by anything on AUR.
Its native-build counterpart is in Arch [community], and that is only used by two packages in that repo. This library is for some specialized mathematical application. It seems it is not in demand in this limited 32-bit binary form. So I suggest to delete this package. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lib32-ppl/