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Looks like the ogre setup doesn't search the right locations for you Cg libraries on Gentoo. Set this before you run make wipe && make in the ogre subfolder.

export Cg_HOME=/opt/nvidia-cg-toolkit

Also, it seems that for some reason gentoo systems end up putting some of the .so files in the wrong folder, so we'll need to move them afterwards.

export Cg_HOME=/opt/nvidia-cg-toolkit 
cd ~/ros/visualization_common/ogre       <-- obviously change this location if required
make wipe && make
rosmake rviz
cp ogre/lib/OGRE/*.so ogre/lib/
rosrun rviz rviz

Of course, now it segfaults. But I'm sure that's something different.