jonkeane commented on issue #49371:
URL: https://github.com/apache/arrow/issues/49371#issuecomment-3941719440

   `@github-actions crossbow submit *cran*` will trigger a job that has the 
target we need to satisfy. That was run and returned clean 
(https://github.com/apache/arrow/pull/49298#issuecomment-3914762965) but I 
suspect there were subsequent changes that are bonking us on that build.
   
   > I feel like if the project is on C++ 20 let's make an effort to support 
this
   
   I understand, and I too wish we had a cleaner story around C++20 support, 
but for now, we have to compile on what's available on CRAN to stay on CRAN 
(which we as a project are committed to still). It won't be forever, they will 
upgrade their buildchain soon enough, but we have to be able to compile with 
what's there today.


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