Suppose `pkgA` links to `Rcpp`, with e.g. LinkingTo: Rcpp It would be useful (from a reproducibility + debugging standpoint) if, upon installation of `pkgA`, the version of `Rcpp` that was actually discovered and linked to was recorded in the (installed) `pkgA`'s DESCRIPTION. For example, after installation, `pkgA`'s DESCRIPTION could gain the field: LinkedTo: Rcpp (0.11.5) It may even be useful to include the repository (if it exists) in that field as well, e.g. LinkedTo: Rcpp (0.11.5, CRAN) As far as I can tell, there is currently no (simple, portable) way to determine this post-installation, so it would be very useful if R appended these annotations on install.