Hello, telepathy-farsight has been renamed to telepathy-farstream upstream. It's required by empathy to have call support. However some other packages (telepathy-qt4 and telepathy-call-ui) still use the old -farsight, so renaming the current package in SVN will render those two packages not build-able, until their perspective upstream adapt to the changes.
So I'll copy telepathy-farsight to -farstream is SVN and submit it as a separate package, then when it's not needed any more we can add the proper obsoletes against telepathy-farsight. -- Ahmad Samir