Error(s) in re-building vignettes:
  ...
--- re-building ‘dimensionality-reduction.Rnw’ using knitr
--- finished re-building ‘dimensionality-reduction.Rnw’

make[1]: Entering directory '/home/hornik/tmp/R.check/r-patched-gcc/Work/PKGS/dimRed.Rcheck/vign_test/dimRed/vignettes'
echo "BNET_BUILD_VIGNETTE: "
BNET_BUILD_VIGNETTE: 
/home/hornik/tmp/R.check/r-patched-gcc/Work/build/bin/Rscript -e "knitr::knit2pdf('dimensionality-reduction.Rnw')"


processing file: dimensionality-reduction.Rnw
  ordinary text without R code

label: pca_isomap_example (with options) 
List of 3
 $ include   : logi FALSE
 $ fig.width : num 4
 $ fig.height: num 4

  ordinary text without R code

label: unnamed-chunk-1 (with options) 
List of 1
 $ eval: logi FALSE

  ordinary text without R code

label: unnamed-chunk-2 (with options) 
List of 1
 $ include: logi FALSE

  ordinary text without R code

label: select_k (with options) 
List of 3
 $ include   : logi FALSE
 $ fig.width : num 11
 $ fig.height: num 5

  ordinary text without R code

label: knngraphs (with options) 
List of 3
 $ include   : logi FALSE
 $ fig.width : num 8
 $ fig.height: num 3

  ordinary text without R code

label: unnamed-chunk-3 (with options) 
List of 1
 $ eval: logi FALSE

  ordinary text without R code

label: plot_quality (with options) 
List of 1
 $ include: logi FALSE

  ordinary text without R code

label: unnamed-chunk-4 (with options) 
List of 1
 $ eval: logi FALSE

  ordinary text without R code

output file: dimensionality-reduction.tex

! Package xcolor Error: Undefined color `fgcolor'.

Error: LaTeX failed to compile dimensionality-reduction.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See dimensionality-reduction.log for more info.
Execution halted
make[1]: *** [Makefile:3: all] Error 1
make[1]: Leaving directory '/home/hornik/tmp/R.check/r-patched-gcc/Work/PKGS/dimRed.Rcheck/vign_test/dimRed/vignettes'
Error in tools:::buildVignettes(dir = "/home/hornik/tmp/R.check/r-patched-gcc/Work/PKGS/dimRed.Rcheck/vign_test/dimRed",  : 
  running 'make' failed
Execution halted