nealrichardson commented on PR #39602:
URL: https://github.com/apache/arrow/pull/39602#issuecomment-1892497618

   Here's an example of the message when cmake is downloaded: 
https://github.com/ursacomputing/crossbow/actions/runs/7530786939/job/20497939288#step:7:24
   
   The offline-maximal build now fails because the image must not have cmake in 
it: 
https://dev.azure.com/ursacomputing/crossbow/_build/results?buildId=59743&view=logs&j=0da5d1d9-276d-5173-c4c4-9d4d4ed14fdb&t=6c939d89-0d1a-51f2-8b30-091a7a82e98c&l=348
   
   So we'll need to install it before the R package test. I can look into that; 
looks like there is `ci/scripts/install_cmake.sh`.
   
   Also, I was looking through the jobs for evidence of where cmake is found 
but too old, haven't found one yet but I have seen some unexpected things. Of 
note, it looks like the jobs that are based on `ubuntu-r-only-r` are 
downloading and using a nightly libarrow (here's the gcc-12 build, for example: 
https://github.com/ursacomputing/crossbow/actions/runs/7530787207/job/20497938858#step:8:27).
 That doesn't seem right, is it? It's faster, but it means that if there's a 
change in the C++ library that we're trying to test with those jobs, it won't 
be tested, nor will the C++ library be compiled with the settings/compilers in 
that job. Seems like `LIBARROW_BINARY=false` needs to be added to them? 
@assignUser? Not related to the changes in this PR, but seems important.


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