R package dependencies not installed from Additional_repositories

Question

I am developing a package that requires the namespace of another package, OpenMx. This package is only available from it\'s own repository, but specifying this repository in

Answer 1

See: http://thecoatlessprofessor.com/programming/r-data-packages-in-external-data-repositories-using-the-additional_repositories-field/

Specifically, note that you can specify:

if (!requireNamespace("namepackage", quietly = TRUE)) {
  install.packages("namepackage", repos = "http://location-of.com/repo")
}

To auto add the repo on package load, use:

.onLoad <- function(libname) {
  repos = getOption("repos")
  repos[""] = "http://location-of.com/repo"
  options(repos = repos)
  invisible(repos)
}

This negates the need to set repos = ... in install.packages().