On 10/11/2008, at 7:54 PM, Prof Brian Ripley wrote:

R_LATEXCMD is defined in R_HOME/etc/Renviron (sourced by R CMD), and
conditionally re-defined in Rd2dvi.

On a sub-architecture build such as the CRAN MacOS distribution that will be R_HOME/etc/<arch>/Renviron, and on that distribution it is defined as 'false'. So you do need to define to a proper value in your environment,
e.g. put R_LATEXCMD=latex in your ~/.Renviron file.

Thanks Brian.  Tried that just now --- and of course it didn't work.
(*Nothing* ever works for me! :-( )  In more detail --- I found that
I didn't *have* a .Renviron file.  So I created one, with the single
line

        R_LATEXCMD=latex

But I got the same error situation as before.  Is there any other action
I need to take to get the system to notice my ~/.Renviron file?

I checked that

        > Sys.getenv("R_LATEXCMD")

now does indeed return "latex".

Be that as it may, I tried the expedient of sudo editing the Renviron
file in R_HOME/etc/i386 and changing ``false'' to ``latex'' in the
definition of R_LATEXCMD.

And *that* worked, at least.
        
It might be worth discussing on R-sig-mac why the default is not 'latex'.
This is what is done on Windows, another system on which a TeX
installation is optional.

I am cc-ing this message to the R-sig-mac list.

        cheers,

                Rolf

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