Seems similar to https://bugs.gentoo.org/show_bug.cgi?id=548312 Reproducible: Always
Created attachment 419222 [details] build.log
Created attachment 419224 [details] emerge --info
should be fixed now http://gitweb.gentoo.org/repo/gentoo.git/commit/?id=073fa98637f186287e871249302badd0893f5f15