Error in re-building vignettes:
  ...
make[1]: Entering directory '/data/gannet/ripley/R/packages/tests-devel/ggrepel.Rcheck/vign_test/ggrepel/vignettes'
rm -rf cache/
R --slave -e 'knitr::knit("ggrepel.Rmd")'


processing file: ggrepel.Rmd
   inline R code fragments

label: setup (with options) 
List of 6
 $ echo   : logi FALSE
 $ results: chr "hide"
 $ warning: logi FALSE
 $ error  : logi FALSE
 $ message: logi FALSE
 $ cache  : logi FALSE

  ordinary text without R code

label: geom_text (with options) 
List of 3
 $ echo      : logi TRUE
 $ fig.width : num 9
 $ fig.height: num 7

  ordinary text without R code

label: geom_text_repel (with options) 
List of 3
 $ echo      : logi TRUE
 $ fig.width : num 9
 $ fig.height: num 7

  ordinary text without R code

label: geom_label_repel (with options) 
List of 1
 $ echo: logi TRUE

  ordinary text without R code

label: geom_text_repel_options (with options) 
List of 3
 $ echo      : logi TRUE
 $ fig.width : num 9
 $ fig.height: num 7

  ordinary text without R code

label: geom_text_repel_point_padding_na (with options) 
List of 3
 $ echo      : logi TRUE
 $ fig.width : num 9
 $ fig.height: num 7

  ordinary text without R code

label: geom_text_repel_empty_string (with options) 
List of 3
 $ echo      : logi TRUE
 $ fig.width : num 9
 $ fig.height: num 7

  ordinary text without R code

label: line_plot (with options) 
List of 3
 $ echo      : logi TRUE
 $ fig.width : num 9
 $ fig.height: num 7

  ordinary text without R code

label: volcano (with options) 
List of 2
 $ echo: logi TRUE
 $ eval: logi FALSE

  ordinary text without R code

label: geom_text_repel_polar (with options) 
List of 3
 $ echo      : logi TRUE
 $ fig.width : num 9
 $ fig.height: num 7

  ordinary text without R code

label: animated (with options) 
List of 2
 $ echo: logi TRUE
 $ eval: logi FALSE

  ordinary text without R code

label: session_info (with options) 
List of 1
 $ echo: logi TRUE

  ordinary text without R code

output file: ggrepel.md

[1] "ggrepel.md"
perl -i -pe 's{figures/}{https://github.com/slowkow/ggrepel/blob/master/vignettes/figures/}' ggrepel.md
# Check if qe have pngquant installed.
[ -x "`which pngquant 2>/dev/null`" ] && \
pngquant --force --speed 1 --quality 0-10 figures/ggrepel/*.png && \
for f in figures/ggrepel/*-fs8.png; do mv -f $f ${f%-fs8.png}.png; done
Makefile:2: recipe for target 'ggrepel.md' failed
make[1]: *** [ggrepel.md] Error 1
make[1]: Leaving directory '/data/gannet/ripley/R/packages/tests-devel/ggrepel.Rcheck/vign_test/ggrepel/vignettes'
Error in buildVignettes(dir = "/data/gannet/ripley/R/packages/tests-devel/ggrepel.Rcheck/vign_test/ggrepel") : 
  running 'make' failed
Execution halted