Found the following significant warnings:
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/catalog_retile.Rd:10: file link ‘catalog’ in package ‘lidR’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/hexbin_metrics.Rd:19: file link ‘hexbin-class’ in package ‘hexbin’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/lastransform.Rd:21: file link ‘spTransform’ in package ‘rgdal’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/lidrpalettes.Rd:26: file link ‘heat.colors’ in package ‘grDevices’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot.Rd:36: file link ‘points3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot.Rd:36: file link ‘plot’ in package ‘graphics’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot.lasmetrics3d.Rd:33: file link ‘points3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot.lasmetrics3d.Rd:47: file link ‘points3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot.lasmetrics3d.Rd:48: file link ‘height.colors’ in package ‘lidR’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot.lasmetrics3d.Rd:49: file link ‘forest.colors’ in package ‘lidR’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot.lasmetrics3d.Rd:50: file link ‘heat.colors’ in package ‘grDevices’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/plot_3d.Rd:31: file link ‘spheres3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpuaCwmg/R.INSTALL147616b0dd6f/lidR/man/set_lidr_threads.Rd:20: file link ‘setDTthreads’ in package ‘data.table’ does not exist and so has been treated as a topic
See ‘/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/lidR.Rcheck/00install.out’ for details.