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You are trying to link the roslib, compiled for your laptop architecture, with your generated arm exec (compiled for your arm architecture). If you want to cross-compile the relevant parts of ros (apparently you will at least need roscpp package) from source on your laptop and than, when cross-compiling your package you have to make sure it is linked against the other ros packages you cross-compiled before and not against the ros packages you installed to run on your laptop....