failed to run custom build command

[tomnick]

hi, at the step "Compile nostr-rs" I am getting the following error:

error: failed to run custom build command for nostr-rs-relay v0.8.8 (/opt/nostr-rs-relay)`

Caused by:
process didn't exit successfully: /opt/nostr-rs-relay/target/release/build/nostr-rs-relay-e52fd45d8c8d75ad/build-script-build (exit status: 1)
--- stdout
cargo:rerun-if-changed=proto/nauthz.proto
cargo:rerun-if-changed=proto

--- stderr
Error: Custom { kind: Other, error: "protoc failed: Unknown flag: --experimental_allow_proto3_optional\n" }

`
I did follow the guide, my system Ubuntu 20.04

[BlockChainCaffe]

Hi Tomnic.
This error concerns the compilation of nostr-rs-relay, while this guide only focuses on how to use that for building your own node.
I just found this in the rust documentation so it seems the compile saw some unexpected changes in the folder/filesystem while it was compiling.
I sugest you ask this to the devs of nostr-rs-relay as I'm not able to answer you. If you find an aswer pleass come back and explai it to su so we can add this useful info in the guide

[tomnick]

Alright, here is the solution as far as I did it:
The protobuf compiler is too old. I installed protoc via https://lindevs.com/install-protoc-on-ubuntu. Now, the compilation ist running thorugh. Do not forget this was on Ubuntu.