Error(s) in re-building vignettes:
--- re-building ‘skellam.rnw’ using knitr
--- finished re-building ‘skellam.rnw’

make[1]: Entering directory '/data/gannet/ripley/R/packages/tests-devel/skellam.Rcheck/vign_test/skellam/vignettes'
xelatex skellam;
This is XeTeX, Version 3.14159265-2.6-0.999991 (TeX Live 2019) (preloaded format=xelatex)
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entering extended mode
(./skellam.tex
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Package hyperref Warning: Rerun to get /PageLabels entry.


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\TU/lmr/m/n/12 See Wikipedia. \TU/lmr/m/it/12 Skellam distribution []$[][][][] 
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[1]
! Argument of \@tempa has an extra }.
<inserted text> 
                \par 
l.153 ...dth=0.5\textwidth]{figure/theFigures-1} }
                                                  
? 
! Emergency stop.
<inserted text> 
                \par 
l.153 ...dth=0.5\textwidth]{figure/theFigures-1} }
                                                  
Output written on skellam.pdf (1 page).
Transcript written on skellam.log.
make[1]: *** [Makefile:11: skellam.pdf] Error 1
make[1]: Leaving directory '/data/gannet/ripley/R/packages/tests-devel/skellam.Rcheck/vign_test/skellam/vignettes'
Error in tools:::buildVignettes(dir = "/data/gannet/ripley/R/packages/tests-devel/skellam.Rcheck/vign_test/skellam",  : 
  running 'make' failed
Execution halted