xmlrpc-epi in now in the tree so secondlife ebuilds should depend on it.
bug 276351 is about keywording xmlrcp-epi for amd64. As secondlife is keyworded for amd64, it will have to wait for it.
I heard Mauro is interesting in cleaning secondlife ebuilds so adding him in CC.
The fact that xmlrpc-epi is in the tree now is great! We definitely want to start using this in the SL builds. However, Muaro said this may soon be deprecated, so it may become moot. In any case, this will be done soon, hopefully.
Fixed in secondlife-1.23_rc4-r1