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I added a bit on the wiki showing what to do specifically: rviz/Troubleshooting#Segfault_during_startup, but if you're still trying to figure it out, OGRE_RTT_MODE is just an environment variable, which you can set from the command-line like so:

export OGRE_RTT_MODE=Copy

or:

export OGRE_RTT_MODE=FBO

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