dragosmg commented on a change in pull request #12119:
URL: https://github.com/apache/arrow/pull/12119#discussion_r782269957



##########
File path: docs/source/developers/guide/step_by_step/building.rst
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@@ -150,5 +150,13 @@ interested to find more information.
 
          - :ref:`build_pyarrow_win`
 
-   .. tab:: Building the R package
 
+   .. tab:: Building the R package
+      
+         When working on code in the R package, you only need to build the 
Arrow C++ 
+         library (often referred to in the R documentation as 'libarrow') from 
source 
+         if you wish to make changes to the code there; otherwise you can 
install a 
+         binary version of the C++ libary and then need to link it up with the 
R package.

Review comment:
       I think this still doesn't work - installing `libarrow` from homebrew 
(on Mac) and having only the R package as `source`. 




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