Error(s) in re-building vignettes:
  ...
--- re-building ‘rare-vignette.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rare.Rcheck/vign_test/rare/vignettes/rare-vignette_files/figure-html/unnamed-chunk-2-1.png
1344x768 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 20152 bytes
Input file size = 21034 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 18084
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 18057
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 18057

Output IDAT size = 18057 bytes (2095 bytes decrease)
Output file size = 18135 bytes (2899 bytes = 13.78% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rare.Rcheck/vign_test/rare/vignettes/rare-vignette_files/figure-html/unnamed-chunk-3-1.png
1920x576 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 42687 bytes
Input file size = 43605 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 38693
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 38693

Output IDAT size = 38693 bytes (3994 bytes decrease)
Output file size = 38771 bytes (4834 bytes = 11.09% decrease)


Quitting from lines 276-279 [unnamed-chunk-10] (rare-vignette.Rmd)
Error: processing vignette 'rare-vignette.Rmd' failed with diagnostics:
there is no package called 'dendextend'
--- failed re-building ‘rare-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘rare-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted