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xelatex skellam;
This is XeTeX, Version 3.14159265-2.6-0.99996 (TeX Live 2016) (preloaded format=xelatex)
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\TU/lmr/m/n/12 See Wikipedia. \TU/lmr/m/it/12 Skellam distribution []$[][][][] 
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*** Error code 138
make: Fatal error: Command failed for target `skellam.pdf'
Current working directory /home/ripley/R/packages/tests32/skellam.Rcheck/vign_test/skellam/vignettes
Error in buildVignettes(dir = "/home/ripley/R/packages/tests32/skellam.Rcheck/vign_test/skellam") : 
  running 'make' failed
Execution halted