Kevin Ushey pointed out to me privately that he submitted a bug report and a patch for this about a month ago, which Kurt Hornik put in R-devel (c79477):

https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17973

On 12/28/20 4:35 AM, Martin Maechler wrote:
Ben Bolker
     on Sun, 27 Dec 2020 15:02:47 -0500 writes:

     > There is a recurring issue with installing from source into paths
     > that contain single quotes/apostrophes. "Why would anyone do that??" is
     > certainly a legitimate response to such a problem, but I would also say
     > this constitutes a legitimate bug.  Would replacing both single-quotes
     > below with \\' solve the problem?

Here, I'm mostly among the  "Why would anyone do that??" people,
but I agree that it's worth some effort to try fixing this.

To your question above: Why don't you create a repr.ex. (we'd
want anyway for R-bugzilla) and *see* if your proposition solves
it - or did I misinterpret the Q?

     > I'm happy to post this (with a patch if my fix seems appropriate) on
     > r-bugzilla.


     > cheers
     > Ben Bolker

     > line 1672 of src/library/tools/R/install.R :

     > cmd <- paste0("tools:::.test_load_package('", pkg_name, "', ",
     > quote_path(lib), ")")


     > 
https://github.com/wch/r-source/blob/2eade649c80725352256f16509f9ff6919fd079c/src/library/tools/R/install.R#L1672

     > 
https://stackoverflow.com/questions/15129888/r-cmd-install-error-unexpected-symbol-in-test-load-package-function

     > 
https://stackoverflow.com/questions/65462881/cannot-download-packages-from-github-from-unexpected-symbol

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