Thrussh crate fails to build

[kyle-figure]

Hello, apologies if this is the wrong place to post a crate build issue but I haven't found this mentioned anywhere else yet.

I am using the direct Bazel dependency method through Bzlmod following the example here.

When I build Thrussh, I get the following error:

thread 'main' panicked at external/rules_rust~~crate~crates__libsodium-sys-0.0.10/build.rs:18:47:
called `Result::unwrap()` on an `Err` value: "\npkg-config exited with status code 1\n> PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 pkg-config --libs --cflags libsodium\n\nThe system library `libsodium` required by crate `libsodium-sys` was not found.\nThe file `libsodium.pc` needs to be installed and the PKG_CONFIG_PATH environment variable must contain its parent directory.\nThe PKG_CONFIG_PATH environment variable is not set.\n\nHINT: if you have installed the library, try setting PKG_CONFIG_PATH to the directory containing `libsodium.pc`.\n"

Full error here:
build_error.txt

Does rules_rust set up this PKG_CONFIG_PATH correctly? What can I do to debug further and possibly patch this build error?

MODULE.bazel

bazel_dep(name = "rules_rust", version = "0.54.1")
RUST_EDITION = "2021"
RUST_VERSION = "1.82.0"
rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
rust.toolchain(
    edition = RUST_EDITION,
    versions = [RUST_VERSION],
)
use_repo(rust, "rust_toolchains")
register_toolchains("@rust_toolchains//:all")
crate = use_extension("@rules_rust//crate_universe:extension.bzl", "crate")
crate.spec(package = "thrussh", version = "0.35.6")
crate.from_specs()
use_repo(crate, "crates")

Command: bazel build @crates//:thrussh
Platform: Ubuntu 22.04 x86_64

[illicitonion]

rules_rust doesn't automatically set anything up for pkgconfig - if you want to use pkgconfig, you'll need to set it up yourself.