The attached patch adjusts eclass/emul-{libs,linux-x86}.eclass for prefix usage.
Created attachment 137558 [details, diff] eclass-emul.patch
Was having problems emerge'ing emul-linux-x86-baselibs on amd64. This patch solved it, thanks Stefan! (BTW, app-emulation/emul-linux-x86-baselibs needs its keywords refreshed pretty bad, it has STABLE keywords.) Thanks.
committed in r15718/15719, thanks.