Build broken on MacOS
Our build process is currently broken on MacOS (due to several issues).
Conan's install script for Boost 1.76 is explicitly disabled on MacOS (see the issue I opened with Conan). Fixing that requires an upstream modification to the Boost Conanfile.
If you fix that, you then get errors building Arrow under Apple Clang-13.0 (although I think this might be an easy fix).
Opening this issue to track the status while I work on resolving it.