lidavidm edited a comment on pull request #10855:
URL: https://github.com/apache/arrow/pull/10855#issuecomment-892094979


   For CI, it appears that Ubuntu 20.04 provides utf8proc 2.5, but the 
isupper/islower functions are not provided until 2.6: 
https://juliastrings.github.io/utf8proc/releases/
   
   Meanwhile, RTools35 is using utf8proc 2.4; it builds utf8proc from source 
due to some other issue, but I believe it's using the system headers anyways 
looking at the compiler command since the system headers come before the 
self-built utf8proc ones. 
   
   I think bumping the minimum utf8proc version and fiddling with the build 
flags so that the utf8proc headers take precedence will be needed.


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