[Rd] R CMD config for R >= 3.0.1

[Berwin A Turlach]

Dear all,

When installing the usual packages that I use, after installing R
3.0.1, I noticed that the installation of some packages that query R about
its configuration did not succeed.  The problem is exemplified by:

berwin at bossiaea:~$ R-3.0.1 CMD config CC
/opt/R/R-3.0.1/lib/R/bin/config: 222: .: Can't open /opt/R/R-3.0.1/lib/R/etc/Renviron

Prior to R 3.0.1 such commands worked fine:

berwin at bossiaea:~$ R-3.0.0 CMD config CC
gcc -std=gnu99


I noticed now that my installations of the development and
patched version of R have the same problem (since I usually do not install
packages in those versions that query the configuration, I hadn't
noticed the issue earlier).  

The problem seems to be line 222 of `R RHOME`/bin/config (when R is R
3.0.1) which reads:

	. ${R_HOME}/etc/Renviron
 
The file ${R_HOME}/etc/Renviron does not necessarily exists if one has
opted for 32/64-bit builds and installed both as sub-architectures,
which I have.  In my installation ${R_HOME}/etc/32/Renviron and
${R_HOME}/etc/64/Renviron exist, but no ${R_HOME}/etc/Renviron.

Is it necessary for R >= 3.0.1 to have one build as
"main"-architecture and the other one as sub-architecture?  I could not
find anything in the NEWS file or the Admin manual that indicated that
this would now be necessary.

Cheers,

	Berwin

For completeness:  

I am running an Ubuntu 12.04 system and:

berwin at bossiaea:~$ echo "sessionInfo()" | R-3.0.1 --slave
R version 3.0.1 (2013-05-16)
Platform: x86_64-unknown-linux-gnu/64 (64-bit)

locale:
[1] C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods    base