andygrove opened a new issue, #1574:
URL: https://github.com/apache/arrow-rs/issues/1574
**Describe the bug**
I get an error when running `cargo test`. This is apparently due to a recent
upgrade to post and likely related to having an old protoc installed (I am
using `libprotoc 3.11.4`). I am filing this issue to help others that hit the
same problem.
```
error: failed to run custom build command for `arrow-flight v12.0.0
(/tmp/arrow-12.0.0.PitgR/apache-arrow-rs-12.0.0/arrow-flight)`
Caused by:
process didn't exit successfully:
`/tmp/arrow-12.0.0.PitgR/apache-arrow-rs-12.0.0/target/debug/build/arrow-flight-32d1e9d97d680e87/build-script-build`
(exit status: 1)
--- stdout
cargo:rerun-if-changed=../format/Flight.proto
--- stderr
Error: Custom { kind: Other, error: "protoc failed: Unknown flag:
--experimental_allow_proto3_optional\n" }
```
**To Reproduce**
Run `cargo test`
**Expected behavior**
Should not fail.
**Additional context**
Add any other context about the problem here.
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