I needed it to unlock my wireless card as, otherwise, I was unable to configure my card and I was getting the following error: RTNETLINK answers: Unknown error 132 Thanks Reproducible: Always
I've added rfkill to the specs for both amd64 and x86[1]. [1] - http://sources.gentoo.org/cgi-bin/viewvc.cgi/releng?view=revision&revision=820