This is caused by #712883. Upgrade libchewing3 to 0.3.4-3 shall fix the problem.
- Bug#713544: ibus-chewing: FTBFS: libchewing.so:... David Suárez
- Bug#713544: [Pkg-ime-devel] Bug#713544: ib... ChangZhuo Chen
- Bug#713544: marked as done (ibus-chewing: ... Debian Bug Tracking System