anthy had released the new upstrem version, and changed library ABI. uim is still depend on libanthy0, but it has gone.
So we need to adopt new anthy ABI/API, especially default encoding (switched from EUC-JP to UTF-8). We uim maintainers are going to deal the problem on the experimental. Our works and TODO list is there: https://wiki.debian.org/JapaneseEnvironment/Uim