Kritias  filed a orphan request for libpfm4 :
The maintainer hasn't updated the package for more than two years.
 https://aur.archlinux.org/account/Kritias/  https://aur.archlinux.org/pkgbase/libpfm4/
Request #13328 has been accepted automatically by the Arch User Repository package request system:
The package base has been flagged out-of-date since 2017-06-02.