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Cross building fastlivo #449

@tmehr-enqt

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@tmehr-enqt

Hi.
I could use some guidance in cross building fastlivo to aarch64, specifically nvidia Jetson.
I have setup the system like advised in the README and can build FAST-LIVO2 natively.
I also have an rootfs for my system setup where I can build FAST-Livo through qemu
However if I try cross building with -DCMAKE_TOOLCHAIN_FILE (the Tool chain file is basically https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compiling-for-linux with my paths) it can't find the ros packages.

Now my assumption is that I will have to set some additional paths for it to find stuff and somehow bend the paths the cmake files from the ros installation is setting but how would I do that?

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