Error(s) in re-building vignettes:
--- re-building ‘ggplot2loon.Rmd’ using rmarkdown
** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/mpg_vs_wt_ggplot_display-1.png
384x384 pixels, 8 bits/pixel, 249 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 5152 bytes
Input file size = 5989 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4230
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 4221
  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 = 4221

Output IDAT size = 4221 bytes (931 bytes decrease)
Output file size = 4299 bytes (1690 bytes = 28.22% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/hp_ggplot_display-1.png
384x384 pixels, 8 bits/pixel, 202 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 3225 bytes
Input file size = 3921 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 2505
  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 = 2505

Output IDAT size = 2505 bytes (720 bytes decrease)
Output file size = 2583 bytes (1338 bytes = 34.12% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/ggplot_p2-1.png
576x480 pixels, 8 bits/pixel, 252 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 6421 bytes
Input file size = 7267 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 5279
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 5266
  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 = 5266

Output IDAT size = 5266 bytes (1155 bytes decrease)
Output file size = 5344 bytes (1923 bytes = 26.46% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/mtcars_smooth-1.png
384x384 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 17140 bytes
Input file size = 17242 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 13991
  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 = 13991

Output IDAT size = 13991 bytes (3149 bytes decrease)
Output file size = 14069 bytes (3173 bytes = 18.40% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/multiple_geoms-1.png
384x384 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 17165 bytes
Input file size = 17267 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 14534
  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 = 14534

Output IDAT size = 14534 bytes (2631 bytes decrease)
Output file size = 14612 bytes (2655 bytes = 15.38% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/multiple_geom_points-1.png
384x384 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 12341 bytes
Input file size = 12431 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 9380
  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 = 9380

Output IDAT size = 9380 bytes (2961 bytes decrease)
Output file size = 9458 bytes (2973 bytes = 23.92% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/fwrap-1.png
480x384 pixels, 8 bits/pixel, 251 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 7727 bytes
Input file size = 8570 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 6616
  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 = 6616

Output IDAT size = 6616 bytes (1111 bytes decrease)
Output file size = 6694 bytes (1876 bytes = 21.89% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/patchwork-1.png
480x384 pixels, 8 bits/pixel, 253 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 8403 bytes
Input file size = 9264 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 7241
  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 = 7241

Output IDAT size = 7241 bytes (1162 bytes decrease)
Output file size = 7319 bytes (1945 bytes = 21.00% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/loon.ggplot.Rcheck/vign_test/loon.ggplot/vignettes/ggplot2loon_files/figure-html/patchwork complex design-1.png
480x384 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 29336 bytes
Input file size = 29450 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 22049
  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 = 22049

Output IDAT size = 22049 bytes (7287 bytes decrease)
Output file size = 22127 bytes (7323 bytes = 24.87% decrease)

--- finished re-building ‘ggplot2loon.Rmd’

Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
SUMMARY: processing the following files failed:
  ‘grammarOfInteractiveGraphics.Rmd’ ‘linking.Rmd’ ‘loon2ggplot.Rmd’
  ‘pipes.Rmd’ ‘thereAndBackAgain.Rmd’

Error: Vignette re-building failed.
Execution halted