alex.shpilkin [1] filed a orphan request for ruby-benchmark-ips [2]:

This package doesn’t build with a current `ruby` without adding a makedepend. This was suggested to the maintainer five months ago, but they still haven’t reacted.

[1] https://aur.archlinux.org/account/alex.shpilkin/ [2] https://aur.archlinux.org/pkgbase/ruby-benchmark-ips/