pitrou commented on a change in pull request #8235:
URL: https://github.com/apache/arrow/pull/8235#discussion_r492823900



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File path: r/README.md
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@@ -102,6 +102,43 @@ elsewhere, you’ll need to build it from source too.
 
 First, install the C++ library. See the [developer
 guide](https://arrow.apache.org/docs/developers/cpp/building.html) for details.
+It's recommended to make a `build` directory inside of the `cpp` directory of
+the Arrow git repository (it is git-ignored). Assuming you are inside 
`cpp/build`,
+you'll first call `cmake` to configure the build and then `make install`.

Review comment:
       >  I'm kinda assuming that if you know how to change the cmake generator 
then you also know how to invoke it.
   
   Sounds fair.




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