enable cargo deny to see that gstreamer is LGPL

tools like cargo deny are extremely useful for enforcing license compliance - they scan the cargo metadata to determine if licenses match an allow/denylist. However, I noticed that my deny for copyleft didn't pick gstreamer up.

This is because the bindings are MIT/Apache, but they dynamically link to the c libraries which are LGPL.

I think it would make sense to create a "fake" empty crate that is called something like gstreamer-lgpl and has the appropriate LGPL SPDX identifier, and add it as a dependency of the binding crates. This will allow automated tools to realize that LGPL exists in their dependency tree.

That would also be misleading though. Dynamically linking to LGPL libraries has different compliance requirements than statically linking to LGPL libraries, and having a LGPL-licensed Rust crate in the dependency tree would suggest the latter.