x11-apps/radeontop is currently at version 0.8 upstream, whereas v0.7 is in the repos. See https://github.com/clbr/radeontop/releases
This fix should be really easy and is overdue half a year already... please don't forget about it :)
+*radeontop-0.8 (14 Nov 2014) + + 14 Nov 2014; Yixun Lan <dlan@gentoo.org> -radeontop-0.7.ebuild, + +radeontop-0.8.ebuild, radeontop-9999.ebuild: + version bump, bug 524702, thanks Philip P. for reporting + hi maintainer, I've pushed this with only one notable change -> x11-libs/libdrm dep instroduced. thanks all