[R-pkg-devel] GitHub Action failed re-building 'sos.Rnw'

Hello:


	  What do you suggest I do to enable GitHub Action to process "sos.Rnw" 
properly?


	  The development version of my "sos" package passes "R CMD check" on 
my Mac but fails in all four platforms under GitHub Action on


https://github.com/sbgraves237/sos


	  The error messages on macOS and Ubuntu release and devel all seems 
the same:


		    * Error: processing vignette 'sos.Rnw' failed with diagnostics: 
Running 'texi2dvi' on 'sos.tex' failed.  Messages: You don't have a 
working TeX binary (tex) installed anywhere in your PATH, and texi2dvi 
cannot proceed without one.


	  The error message under Windows seemed crudely similar but different:


		    * Error: processing vignette 'sos.Rnw' failed with diagnostics: 
pdflatex is not available


	  What do you suggest?
	  Thanks,
	  Spencer Graves