title: Making an R package PDF manual using devtools
body: <p>I am making an R package using devtools and roxygen2. I can get a PDF manual using R CMD but I am really curious as to whether this can be done using devtools. devtools' build(), check(), install() all don't make a PDF manual. Is this tied to making vignettes?</p>
  
  <p>I have read and referred to a similar thread <a href="https://stackoverflow.com/questions/29983177/package-development-location-of-pdf-manual-and-vignette/30607455#30607455">Package development : location of pdf manual and vignette</a></p>