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It's probably not getting the correct include path, since pcl-1.8 is in the path of the header you need. You'll need to ensure that the package you're building is finding pcl 1.8 rather than 1.7 or some other version and then ensure that it's passing the correct include paths to the building of your library/executable. It might be useful to run with VERBOSE=1 to see what arguments are being passed to c++.