libpurple-nonprism is stable (a modified version without services protocols like
Facebook, QQ, Google Talk, MSN, Gadu Gadu, ICQ, Myspace, etc), some packages like
telepathy-haze which is a dependency of
libpurple were removed from
empathy-nonprism is a modified version without
telepathy-haze recommendation, this means
empathy-nonprism isn't needed anymore since version
3.10.1-1 and it will be removed from repos.
You should install the
empathy package manually using regular pacman methods. Accept the
empathy-nonprism removal and that's it.