Looks like blender needs a binNMU to build against the v5 version of opencolorio. Then blender, ogre-1.9, and dependencies can transition https://packages.qa.debian.org/b/blender.html
- Bug#778034: ogre-1.9 transition, blender needs binNMU Scott Howard
- Bug#778034: ogre-1.9 transition, blender needs bin... Jonathan Wiltshire