Build fails with darknet-rust and opencv on Arch Linux

[ImanolGo]

Description:

I am encountering a build failure when trying to use the darknet-rust crate in combination with the opencv crate in my Rust project on Arch Linux. The project builds fine when either crate is used independently, but combining them leads to a build error related to libclang.

Environment:

• OS: Arch Linux - 6.5.9-arch2-1
• Rust version: 1.73.0
• clang version: 16.0.6
• darknet-rust version: 0.4
• opencv version: 0.85.3

Steps to Reproduce:

1. Create a new Rust project.
2. Add darknet-rust and opencv to Cargo.toml.
3. Run cargo build.

Error Log:

=== Detected OpenCV module header dir at: /usr/include/opencv4/opencv2
=== Found OpenCV version: [version] in headers located at: /usr/include/opencv4
=== Generating code in: [...]/test_darknet/target/debug/build/opencv-[hash]/out
=== Placing generated bindings into: [...]/test_darknet/target/debug/build/opencv-[hash]/out/opencv
=== Using OpenCV headers from: /usr/include/opencv4
thread 'main' panicked at [...]/.cargo/registry/src/index.crates.io-[hash]/clang-sys-1.6.1/src/lib.rs:1735:1:
a `libclang` shared library is not loaded on this thread
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...

Troubleshooting Steps:

• Set LIBCLANG_PATH to /usr/lib.
• Tried different versions of the crates.
• Installed libclang and verified its presence.

Any help or guidance on resolving this issue would be greatly appreciated.