[R] How to determine if R is 64 bit compiled under Unix-alike?

[Przemek Grabowicz]

On 07/05/2010 10:52 PM, Marcin Jaworski wrote:
> Try:
>
> .Machine$sizeof.pointer
>
> If you get 8, you are riding 64 bit R. If you get 4, your R is 32-bit one.
>    

I got 8, so should be 64 bits. But I have problems with some package, 
could it be that it is 32-bit? It was installed using:

R CMD INSTALL foobar.tar.gz

On MacOS using

R64 CMD INSTALL foobar.tar.gz

gave proper effect. But here on Ubuntu it seems that objects from that package are not able to load much data.