Sato should be using GStreamer 1.0 exclusively, and not 0.10.
Patches on the list, on the assumption that Gaku was the only thing actually pulling in GStreamer 0.10.
Fixed in 09fea7f3c0520e555af95234ceb860bd9b4d2878.
Verified in master (7f30749fe026e9ceb75d73b89271145a45a60763)