Cannot compile in a dependency package needing an external library

My project depends on an external package, which in turn depends on an external for it binary library.

When I download the external package and library and build/test it as a project (passing to cargo "-Lexternal-library-path/"), it works. When I try to compile my project, the external package is downloaded but refuses to compile due to not finding the external library:

error: could not find native static library `<library name>`, perhaps an -L flag is missing?

error: could not compile `<external package name>` due to previous error

I downloaded the library separately and tried passing its path to cargo through -L:

env RUSTFLAGS="-Lexternal-library-path/" cargo build
cargo build -- "-Lexternal-library-path/"
env RUSTFLAGS="-Lexternal-library-path/" cargo build -- "-Lexternal-library-path/"

No go. Using cargo 1.65.0 on Debian GNU/Linux.

Any suggestions? Thanks in advance.

Rust projects generally don't use flags directly. External packages use wrapper crates called sys crates that set the flags from their

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