Such as boost, where can I specify the following:
1.External c++ header file include path 2.External c++ source file 3.External c++ link library file path
It all goes into src/Makevars as explained in
src/Makevars
the fine manual Writing R Extensions that came with R
either the Writing a package using Rcpp vignette or my book both of which I told you about in ...
... my replies to your post on rcpp-devel