Found the following significant warnings:
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/as.mesh3d.Rd:73: file link ‘as.mesh3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/as.mesh3d.Rd:73: file link ‘tmesh3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/intersect.Rd:34: file link ‘intersect’ in package ‘base’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/nat-package.Rd:35: file link ‘graph’ in package ‘igraph’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/nat-package.Rd:116: file link ‘rgl’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/nat-package.Rd:123: file link ‘rgl’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/neuron.Rd:96: file link ‘igraph’ in package ‘igraph’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/ngraph.Rd:48: file link ‘set.vertex.attribute’ in package ‘igraph’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/ngraph.Rd:118: file link ‘set.vertex.attribute’ in package ‘igraph’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/nlapply.Rd:55: file link ‘sapply’ in package ‘base’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/npop3d.Rd:21: file link ‘pop3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/plot3d.boundingbox.Rd:12: file link ‘segments3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/plot3d.dotprops.Rd:69: file link ‘points3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/plot3d.dotprops.Rd:70: file link ‘segments3d’ in package ‘rgl’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/read.morphml.Rd:11: file link ‘xmlParse’ in package ‘XML’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/read.morphml.Rd:13: file link ‘xmlParse’ in package ‘XML’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/read.neuron.fiji.Rd:12: file link ‘xmlParse’ in package ‘XML’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/read.neuron.neuroml.Rd:13: file link ‘xmlParse’ in package ‘XML’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/read.neuron.swc.Rd:31: file link ‘igraph’ in package ‘igraph’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/setdiff.Rd:37: file link ‘setdiff’ in package ‘base’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/spine.Rd:66: file link ‘shortest.paths’ in package ‘igraph’ does not exist and so has been treated as a topic
  Rd warning: /tmp/Rtmp3S6GrB/R.INSTALL71c67e54d6e1/nat/man/union.Rd:34: file link ‘union’ in package ‘base’ does not exist and so has been treated as a topic
See ‘/home/hornik/tmp/R.check/r-patched-gcc/Work/PKGS/nat.Rcheck/00install.out’ for details.