Change toFLANN_INCLUDE_DIRfromFLANN_INCLUDE_DIRS #pcl_all_in_one_installer.cmake#L14-get_filename_component(FLANN_ROOT "${FLANN_INCLUDE_DIRS}" PATH)+get_filename_component(FLANN_ROOT "${FLANN_INCLUDE_DIR}" PATH) AddFLANN_INCLUDE_DIRSin cmake/Modules/FindFLANN.cmake +set(FLANN_INCLUDE_DI...