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With ogre 1.12.0 I got a compiler error in my project that FunctionStageRef is unknown in

RTShaderSystem/OgreShaderFFPLighting.h

and

RTShaderSystem/OgreShaderExPerPixelLighting.h

I think there is the include OgreShaderFunction.h missing.

you should rather use the <OgreRTShaderSystem.h> module header instead of using the individual headers directly to avoid such problems.
Fixed that particular issue in https://github.com/OGRECave/ogre/pull/1216 though.

Many thanks