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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.