packages checks on OS X with 2.12 devel

I'm checking packages under the devel version on OS X

sessionInfo()

R version 2.12.0 Under development (unstable) (2010-08-08 r52687)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

I install packages via install.packages with type = "source" (I stick
to arch=x86_64). I've had no issues with installs.

When I check packages via

  R --arch=x86_64 CMD check package

I see:

  * using platform: x86_64-apple-darwin9.8.0 (64-bit)
?
  * loading checks for arch ?i386?
?
  * loading checks for arch ?x86_64?
?
  ** running examples for arch ?i386?

The check then fails since the packages are not installed on i386. I tried

  R --arch=x86_64 --no-multiarch CMD check package

but that still runs checks on x86_64 and i386. I didn't find anything
else in the "what's new" for the latest devel version.

I'd prefer not to install the full crane and bioconductor set in both
architectures. Any suggestions (especially for the documentation that
I'm sure exists but I can't find).

R version 2.12.0 Under development (unstable) (2010-08-08 r52687)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

I install packages via install.packages with type = "source" (I stick
to arch=x86_64). I've had no issues with installs.

What is very strange is that you seem to have built R with two archs: why if
you don't want to use i386? ?If you build R with just one arch, it will only
install/check ... that one arch. ?So this is shooting yourself in the foot!

--no-multiarch is an option to check, not to R.