Sorry I can't give more info. When I emerge rte it errors out as well as killing my X session. (Quite a bug) Zapping uses this lib so it is also broken. I tried emerging from a terminal and was able to see the error but unfortunately my mouse in console mode doesn't work so no cut an paste.
can you do me a favour and do this: emerge rte &>~/rte.log that will put a file called rte.log in your HOME dir (so if you do it as root it will be in /root Please, if you could give us logs for both an attempt in X and an attempt in console.
actually, shad, I've just checked in a new ebuild for it (no revision bump). Please emerge rsync and try this again...
Created attachment 3608 [details] log of rte build
eVerything seems to work here