david-cortes commented on issue #43546:
URL: https://github.com/apache/arrow/issues/43546#issuecomment-2266038106

   > Setting `NOT_CRAN=true` will use nproc for the build
   
   It was just an example. Same happens for other types of build flags, like 
compiler, preprocessor and linker flags which a user might also want to 
customize.
   
   > You can also set MAKEFLAGS as an envvar which will be picked up by the 
libarrow build.
   
   Yes, I guess one can set standard env. vars for the build system if needed, 
but the issue is: R packages are meant to follow the R configuration when 
compiling rather than following standard env. variables like `CC` and such. 
Other R packages do not require setting up flags in special ways.


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