In R programming, we need to link to native routines in C, C++, or Fortran from the R environment. In most cases, the linking works within one package, namely the R code in a package calls the native code in the same package.
This is not necessarily always the case. It can happen that a piece of C or R code in a package needs to link to native routines in another R package. The Writing R Extensions manual describes how to do this in the section Linking to native routines in other packages. However, some details were not clear to me, and I could find no demo dedicated to this purpose.
Therefore, I decided to build a demo that is available at my Github repository Accio/demo-linking-native. Besides implementing the linking of native routines between R packages, the project also documents issues that I met and how I solved them.
In case you find the demo useful or you have suggestions how to improve it, please let me know.