h-vetinari commented on PR #14102:
URL: https://github.com/apache/arrow/pull/14102#issuecomment-1247579632

   > We need LLVM headers to use Gandiva. (Some public Gandiva headers use LLVM 
headers.) If we build PyArrow with Gandiva support, we need LLVM as a 
build-time dependency.
   
   Yes, and LLVM + its headers are during build time from the standard location 
in the `$PREFIX`. CMake is easily able to find it based on that, but the custom 
(AFAICT) `findLLVMAlt` has it's own checks that fail to find it now (or need 
something more; is `LLVM_DIR` suppqosed to be `$PREFIX/lib` or 
`$PREFIX/include/llvm` or something else?)


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