Error(s) in re-building vignettes:
  ...
--- re-building ‘cars.Rmd’ using rmarkdown

Quitting from lines 17-32 [cars_setup] (cars.Rmd)
Error: processing vignette 'cars.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘cars.Rmd’

--- re-building ‘illusions.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/knitrBootstrap.Rcheck/vign_test/knitrBootstrap/vignettes/illusions_files/figure-html/illusions_cafe_wall-1.png
504x504 pixels, 8 bits/pixel, 15 colors in palette
Reducing image to 4 bits/pixel, 15 colors in palette
Input IDAT size = 2034 bytes
Input file size = 2169 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 892
  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 = 892

Output IDAT size = 892 bytes (1142 bytes decrease)
Output file size = 1027 bytes (1142 bytes = 52.65% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/knitrBootstrap.Rcheck/vign_test/knitrBootstrap/vignettes/illusions_files/figure-html/illusions_ouchi-1.png
504x504 pixels, 8 bits/pixel, 2 colors in palette
Reducing image to 1 bit/pixel, 2 colors in palette
Input IDAT size = 3494 bytes
Input file size = 3590 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 342
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 340
  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 = 340

Output IDAT size = 340 bytes (3154 bytes decrease)
Output file size = 436 bytes (3154 bytes = 87.86% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/knitrBootstrap.Rcheck/vign_test/knitrBootstrap/vignettes/illusions_files/figure-html/illusions_fraser-1.png
504x504 pixels, 8 bits/pixel, 3 colors in palette
Reducing image to 2 bits/pixel, 3 colors in palette
Input IDAT size = 4217 bytes
Input file size = 4316 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 1234
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 1231
  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 = 1231

Output IDAT size = 1231 bytes (2986 bytes decrease)
Output file size = 1330 bytes (2986 bytes = 69.18% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/knitrBootstrap.Rcheck/vign_test/knitrBootstrap/vignettes/illusions_files/figure-html/illusions_fraser_wilcox-1.png
504x504 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 109317 bytes
Input file size = 109551 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 76388
  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 = 76388

Output IDAT size = 76388 bytes (32929 bytes decrease)
Output file size = 76466 bytes (33085 bytes = 30.20% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/knitrBootstrap.Rcheck/vign_test/knitrBootstrap/vignettes/illusions_files/figure-html/illusions_parallel_lines-1.png
504x504 pixels, 8 bits/pixel, 250 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 6316 bytes
Input file size = 7156 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 5343
  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 = 5343

Output IDAT size = 5343 bytes (973 bytes decrease)
Output file size = 5421 bytes (1735 bytes = 24.25% decrease)

[WARNING] This document format requires a nonempty <title> element.
  Defaulting to 'illusions.knit' as the title.
  To specify a title, use 'title' in metadata or --metadata title="...".
--- finished re-building ‘illusions.Rmd’

Note: skipping ‘maps.Rmd’ due to unavailable dependencies:
  'ggplot2', 'reshape2'

--- re-building ‘math.Rmd’ using rmarkdown
[WARNING] Could not convert TeX math \begin{aligned}
  \dot{x} &amp; = \sigma(y-x) \\
  \dot{y} &amp; = \rho x - y - xz \\
  \dot{z} &amp; = -\beta z + xy
  \end{aligned}, rendering as TeX
[WARNING] Could not convert TeX math  P(E)   = {n \choose k} p^k (1-p)^{ n-k} , rendering as TeX
[WARNING] Could not convert TeX math  \frac{1}{\Bigl(\sqrt{\phi \sqrt{5}}-\phi\Bigr) e^{\frac25 \pi}} =
  1+\frac{e^{-2\pi}} {1+\frac{e^{-4\pi}} {1+\frac{e^{-6\pi}}
  {1+\frac{e^{-8\pi}} {1+\ldots} } } } , rendering as TeX:
   \frac{1}{\Bigl(\sqrt{\phi \sqrt{5}}-\ph
                ^
  unexpected control sequence \Bigl
  expecting "%", "\\label", "\\tag", "\\nonumber", whitespace or "\\allowbreak"
[WARNING] This document format requires a nonempty <title> element.
  Defaulting to 'math.knit' as the title.
  To specify a title, use 'title' in metadata or --metadata title="...".
--- finished re-building ‘math.Rmd’

Note: skipping ‘two-D.Rmd’ due to unavailable dependencies: 'igraph'

SUMMARY: processing the following file failed:
  ‘cars.Rmd’

Error: Vignette re-building failed.
Execution halted