nealrichardson commented on issue #35472:
URL: https://github.com/apache/arrow/issues/35472#issuecomment-1543938687

   It's currently [`make 
sync-cpp`](https://github.com/apache/arrow/blob/main/r/Makefile#L40-L49), 
though putting that in `bootstrap.R` like Dewey proposed would help so that you 
don't have to maintain ad-hoc `if arrow` logic.
   
   For the nightly/on-demand autobrew build, we don't use that vendored source 
(though presumably there would be a way?). Instead we use a copy of the 
formula(e) where we pin to a git SHA, so that when we `brew install --HEAD` it 
builds the right C++ code. That looks like 
https://github.com/ursacomputing/crossbow/blob/nightly-packaging-2023-05-08-0-github-r-binary-packages/.github/workflows/crossbow.yml#L47-L86
 (the workflow is templated).


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