[Rd] Problem setting environment variable in R/zzz.R

[Dirk Eddelbuettel]

I am trying to get the Rmetrics.org component package fBasics by Diethelm
Wuertz into a Debian package. Thanks to a lot of work by Diethelm, it is
_almost_ there. It fails 'R CMD check' for me if I do not have the TZ
environment variable set [1], yet works fine as long as I set TZ.

I figured I could patch this in R/zzz.R and do 

    ## set a timezone if none found in environment variables or options()
    if (Sys.getenv("TZ")=="") {
      if (is.null(getOption("TZ"))) {
        cat("No timezone information found, using default of GMT\n")
        Sys.putenv("TZ"=="GMT")
      } else {
        cat("No timezone information found, applying option() value of",
            getOption("TZ"), "\n")
        Sys.putenv("TZ"==getOption("TZ"))
      }
    }

right before   library.dynam("fBasics", pkg, lib)  concludes .First.lib().

Now, even with that little patch, the R CMD check still fails.  Which means
that the package could fail CRAN tests unless CRAN has TZ set. That is a bit
of a gamble I'd rather avoid.

What am I doing wrong here?

Thanks,  Dirk


[1] There is a bit of a Debian tradition to, if in doubt, cover things via
    a configuration file in /etc rather than an environment variable. I got
    rather used to that, and like living without env.vars.

-- 
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