MarsSeed [1] filed a deletion request for compiler-rt90 [2]: This clang compiler package for the legacy 2019 release is not needed anymore by any other build on AUR.
Also its dependency, llvm90 fails to build. Safe to delete. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/compiler-rt90/
