[Rd] package installation fails when symlink of same name exists

[Jeroen Ooms]

On Tue, Jul 19, 2016 at 6:46 PM, Kevin Ushey <kevinushey at gmail.com> wrote:
> R fails to install a package from source over a pre-existing package
> when the path to that package is a symlink, rather than a directory.
> ...
> I don't think anyone's reported this being an issue before

I ran into this as well a while back:
https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=16725