Error en build de guest (thread 'main' panicked en risc0-build-2.3.1/lib.rs:66)

[albert-pano]

Title: Build failure: guest v0.1.0 panics at risc0-build-2.3.1/src/lib.rs:66:45 (Option::unwrap() on None)
Description
Hello,
I’m trying to build the risc0-merkle-service project following the official instructions, but the build consistently fails with the following panic during the guest compilation step.

Environment
OS: Ubuntu 24.04 LTS (clean installation)

Rust: rustc 1.88.0 (installed via rzup)

cargo-risczero: 2.3.1

cpp toolchain: 2024.1.5

Docker: version 27.5.1 (I also tried RISC0_NO_DOCKER=1, same issue)

Steps to reproduce
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git clone https://github.com/risc0/light-node.git
cd light-node/risc0-merkle-service
rzup install
export PATH="$HOME/.risc0/bin:$PATH"
cargo risczero build
Observed error
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error: failed to run custom build command for guest v0.1.0 (/src/methods)

Caused by:
process didn't exit successfully: /src/target/release/build/guest-d8a8c09df34dc721/build-script-build (exit status: 101)
--- stderr

thread 'main' panicked at /root/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/risc0-build-2.3.1/src/lib.rs:66:45:
called Option::unwrap() on a None value
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
This issue happens every time, even after:

cargo clean

fresh rzup install

disabling Docker (export RISC0_NO_DOCKER=1)

Expected behavior
The project should build successfully as per documentation.

Additional notes
Possibly a missing environment variable or an unhandled None case in risc0-build.

Other users may be affected if they build from a fresh environment.

Could you please advise or confirm if this is a known issue?

Thanks in advance!

[tenalinek]

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