Dear list (re-posting from r-help as r-devel is probably more appropriate),
I was able to successfully compile R on our AIX box at work using the
GNU compilers following the instructions on the R Administration
guide. The output can be seen at here
(https://gist.github.com/nguyenvinh/504321ea9c89
From Hadley's C best practices
(http://r-pkgs.had.co.nz/src.html#c-best-practices):
> Like with C++, whenever you use C code in your package, you should unload the
> DLL when the package is unloaded:
.onUnload <- function (libpath) {
library.dynam.unload("mypackage", libpath)
}