scpeters commented on PR #49436:
URL: https://github.com/apache/arrow/pull/49436#issuecomment-4008195488

   > I am unsure why pinning `protobuf@33` (which installs it correctly) seems 
to lead to CMake not finding it:
   > 
   > ```
   > 2026-03-05T11:54:41.8568190Z -- Could NOT find protobuf (missing: 
protobuf_DIR)
   > 2026-03-05T11:54:44.7952510Z -- Could NOT find Protobuf (missing: 
Protobuf_LIBRARIES Protobuf_INCLUDE_DIR) 
   > 2026-03-05T11:54:44.7953470Z -- Protobuf: Building Protocol Buffers from 
source using FetchContent
   > ```
   > 
   > and thus failing with building other dependencies: 
https://github.com/apache/arrow/actions/runs/22716367408/job/65866946432?pr=49436
   
   I'm not familiar with how CI works in this project, but I do know that 
`protobuf@33` is "[keg-only](https://docs.brew.sh/FAQ#what-does-keg-only-mean)" 
in homebrew which means it is not linked into the default prefix and most tools 
won't find it. See https://github.com/gazebo-tooling/release-tools/pull/1454 
for an example of CI environment changes needed to use "keg-only" formulae from 
brew.


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