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While I don't know for sure, I'm pretty confident that catkin itself does not need librt, as it is just a set of cmake files topped with a handful of scripts.

Besides, using UNIX here seems inadequate, as it will disable linking against librt for Linux too. The toolchain file for QNX (if you are using one) most likely defines the QNX macro that you can use instead of UNIX in the rt.cmake file.

Hope this helps.