The tar version supplied by Gentoo isn't patched yet and thus still has this problem. Please note that this problem only occurs when your system is uclibc-based. A patch can be found here, which works great for me.
Created attachment 47476 [details, diff] tar patch This patch lets tar work correctly with bzip2.
we dont support tar-1.14 yet in uclibc becuase we havent gotten around to adding that patch
Is there a problem adding it?
nope, just havent gotten around to it
tar-1.15.1 now in portage