[R-SIG-Mac] R 3.3.1 for OS X 10.7.5

[Vittorio De Martino]

As a long run user of R on linux and mac os x I'm an absolute beginner with this list. 
I have been smoothly using R on my macbook with Lion 10.7.5 regularly updating it by means of the CRAN binary precompiled distributions also resorting to http://r.research.att.com/. 
Now I see that the new version  3.3.1 is only available for Mavericks 10.9 and there's no a precompiled distribution (even in http://r.research.att.com/).
Does this mean that from now on support for Lion (or Snowleopard) binary precompiled distribution is terminated forever or is there a way to compile R 3.3.1?
Should I stick forever to 3.2.5?
Ciao
Vittorio