Found the following significant warnings:
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/dot-collapse_timestamp.Rd:19: file link ‘floor_date’ in package ‘lubridate’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/dot-collapse_timestamp.Rd:34: file link ‘floor_date’ in package ‘lubridate’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/dot-collapse_timestamp.Rd:35: file link ‘ceiling_date’ in package ‘lubridate’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/dot-collapse_timestamp.Rd:36: file link ‘ceiling_date’ in package ‘lubridate’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/metrics.Rd:96: file link ‘floor_date’ in package ‘lubridate’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/metrics.Rd:96: file link ‘ceiling_date’ in package ‘lubridate’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/sfn_mutate_at.Rd:26: file link ‘mutate_at’ in package ‘dplyr’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/sfn_mutate_at.Rd:12: file link ‘mutate_at’ in package ‘dplyr’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/sfn_mutate_at.Rd:14: file link ‘mutate_at’ in package ‘dplyr’ does not exist and so has been treated as a topic
  Rd warning: /home/hornik/tmp/scratch/RtmpXzcB6P/R.INSTALL218f35430bb8/sapfluxnetr/man/sfn_mutate_at.Rd:17: file link ‘mutate_at’ in package ‘dplyr’ does not exist and so has been treated as a topic
See ‘/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/sapfluxnetr.Rcheck/00install.out’ for details.