nealrichardson commented on issue #38047:
URL: https://github.com/apache/arrow/issues/38047#issuecomment-1755635551

   I don't think removing the cmake installation is a good idea. I recognize 
that it's in a legal gray area in terms of CRAN policy, but I don't think it's 
worth the cost to UX if we remove it. Moreover, assuming CRAN approves the 
libarrow binary downloading, the source build with cmake is only a fallback 
anyway for other systems, the "approved" path won't touch it.
   
   We don't download by default, we check in several locations and only 
download if an insufficient version is not found. 
   
   On CRAN machines, at least the regular check ones I spot-checked, we use 
system `cmake`, no downloading. You can confirm this in the build logs (go to 
the check page, click on a check result, and change the URL to be `00install` 
like 
https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-gcc/arrow-00install.html).
 
   
   Comparing checksums isn't a bad idea, though IMO I wouldn't do it as part of 
this release, so as not to draw attention to the cmake code.
   
   


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