Recently, there has been some version of several versions: one of the apt-get repos, one in /usr/local . Try to find it ...
Otherwise, I will get up at 2.14.1 on Friday morning, Michael will do his magic, and the repo will have .deb 2.14.1 packages “soon”, sometimes during the day.
Finally, you can see which flags are used to get package sources for which you simply run apt-get source r-base (and this works for any Debian / Ubuntu package in this way if you have source links in the apt file.
Edit: By the way, regarding the "64-bit" aspect of your question: Nada. We do nothing differently. It is simply a “host system” that is more generous with resources. But R finds everything he needs to know for himself, using configure logic, etc.
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