This rarely comes up, because most people (in my experience) don't explicitly set R_HOME in regular terminals, but do have RScript in the path. If you use the RStudio-supplied Terminal, however, they do explicitly set R_HOME, which then causes the hook installs to break on some platforms (e.g., AWS Ubuntu is where I encountered the problem).

While some distributions add symlinks, the default install location for RScript is $R_HOME/bin/Rscript:
https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installation

I believe it can be fixed in just one spot:

Just adding bin to that path join should solve the issue.