Github user holdenk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13199#discussion_r64311830
  
    --- Diff: docs/README.md ---
    @@ -20,8 +20,10 @@ installed. Also install the following libraries:
         $ sudo pip install Pygments
         # Following is needed only for generating API docs
         $ sudo pip install sphinx
    -    $ Rscript -e 'install.packages(c("knitr", "devtools"), 
repos="http://cran.stat.ucla.edu/";)'
    +    $ sudo Rscript -e 'install.packages(c("knitr", "devtools", "roxygen2", 
"testthat"), repos="http://cran.stat.ucla.edu/";)'
    --- End diff --
    
    So it definitely didn't work on my machine - I think it depends on how your 
R is set up (for example on my machine lib points to 
`/usr/local/lib/R/site-library`). I _think_ having sudo would make it 
consistent (since I think users can also setup pip/gem to default to user 
specific or site wide).


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