Error in re-building vignettes:
  ...
You are recommended to install the tinytex package to build PDF.FALSE
Latexmk: This is Latexmk, John Collins, 25 May 2018, version: 4.56.
Rule 'pdflatex': File changes, etc:
   Changed files, or newly in use since previous run(s):
      'RcppGSL-intro.aux'
   Non-existent destination files:
      'RcppGSL-intro.pdf'
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Run number 1 of rule 'pdflatex'
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Running 'pdflatex  -halt-on-error -interaction=batchmode -recorder  "RcppGSL-intro.tex"'
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Latexmk: applying rule 'pdflatex'...
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
Latexmk: List of undefined refs and citations:
  Citation `CRAN:Rcpp' on page 1 undefined on input line 176
  Citation `CRAN:Rcpp' on page 1 undefined on input line 70
  Citation `CRAN:Rcpp' on page 7 undefined on input line 1065
  Citation `CRAN:Rcpp:Attributes' on page 7 undefined on input line 1000
  Citation `CRAN:Rcpp:Attributes' on page 7 undefined on input line 1064
  Citation `CRAN:RcppArmadillo' on page 2 undefined on input line 301
  Citation `CRAN:RcppEigen' on page 2 undefined on input line 305
  Citation `CRAN:inline' on page 6 undefined on input line 934
  Citation `Eddelbuettel+Sanderson:2013:RcppArmadillo' on page 2 undefined on input line 301
  Citation `Eddelbuettel:2013:Rcpp' on page 1 undefined on input line 176
  Citation `Eddelbuettel:2013:Rcpp' on page 1 undefined on input line 70
  Citation `GSL' on page 1 undefined on input line 70
  Citation `GSL' on page 1 undefined on input line 78
  Citation `GSL' on page 7 undefined on input line 1070
  Citation `JSS:Rcpp' on page 1 undefined on input line 176
  Citation `JSS:Rcpp' on page 1 undefined on input line 70
  Citation `JSS:RcppEigen' on page 2 undefined on input line 305
  Citation `R:Main' on page 1 undefined on input line 105
  Citation `Sanderson:2010:Armadillo' on page 2 undefined on input line 303
  Reference `LastPage' on page 1 undefined on input line 184
Latexmk: Summary of warnings from last run of (pdf)latex:
  Latex failed to resolve 1 reference(s)
  Latex failed to resolve 19 citation(s)
Collected error summary (may duplicate other messages):
  pdflatex: Command for 'pdflatex' gave return code 1
      Refer to 'RcppGSL-intro.log' for details
Latexmk: Use the -f option to force complete processing,
 unless error was exceeding maximum runs, or warnings treated as errors.
=== TeX engine is 'pdfTeX'
Latexmk: Errors, so I did not complete making targets
! LaTeX Error: Lonely \item--perhaps a missing list environment.

Error: processing vignette 'RcppGSL-intro.Rmd' failed with diagnostics:
Failed to compile RcppGSL-intro.tex. See RcppGSL-intro.log for more info.
Execution halted