At system level:
% sudo apt-get install libxml2 libcurl4-openssl-dev
R will take care of everything else 
Bioconductor having an absolute requirement of having R pre-installed, make sure it is! !
sudo is necessary because we want to install at system-level, not user-level.% sudo R
>source("http://www.bioconductor.org/biocLite.R")
>biocLite()
>biocLite("rama")
>biocLite("bridge")